How to Make a Plaster Cast of your Breast Root
Slight nudity warning!
Guest Blog Post By: Anne Bertha
I’ve been making bras now for two years. Very soon in that process, people told me that the first thing you should do is search for a wire that fits you. Well, that proved to be very difficult. By now I have a whole range of different sizes and styles of wires, but none of them really seem to fit me. After noticing a post on Facebook of someone who made a plaster cast of her ribcage and seeing the transformation in bra fit, I decided to make my own plaster cast. This is the tutorial.
You will need:
- Plaster gauze. For a cast of one underbust, I used 2 rolls of 3 m by 7.5 cm (3.3 yds by 3 inches).
- Scissors, to cut the plaster gauze in pieces.
- Latex (or other) gloves. It gets real messy.
- Petroleum jelly or olive oil. You want the cast to come off your body easily. For my first try, I used petroleum jelly and for the second one, I used olive oil. I must say I liked the olive oil better. It’s just easier to wash off afterwards.
- A bucket (not the best one you have).
- Towels (not the best ones you have) or a sheet of plastic to cover your working station.
- Preferably a person to put the cast on you. It can be done by yourself, but that makes it much harder.
When doing my cast, I stood in the bathtub. There will be splashing of plaster drops, so make sure you think about that beforehand. A day after making the cast, I still find plaster spots everywhere in my bathroom.
How to do it:
1. Gather all of your materials, and put them near you. Make a working station, preferably at a convenient height. Especially when you do your cast yourself, you don’t want to move too much or else the cast in progress will also move.
2. Cut up the plaster gauze in pieces of different lengths. When doing a cast of your whole underbust, make sure you have two piles, one for each underbust. That way the cast will more likely be evenly thick around.
3. You want to wear as little clothes as possible. I advise a bikini bottom which will wash out easily. If the side of your breast crease is hard to identify like mine, mark it with a (non-permanent) marker.
4. Fill the bucket with water of the temperature indicated on the plaster gauze packaging.
5. Find a comfortable position. This can be seated or standing, try to sit or stand as naturally as possible.
6. Put on the gloves. Time to do this!
7. Apply vaseline or olive oil (I recommend olive oil after doing this a second time) to your underbust, it’s best to cover a slightly larger area to be sure it will all come off easily. It’s best to be thorough but don’t add a layer that’s too thick because otherwise the plaster won’t stick well and slide down.
8. Pick up a piece of the plaster gauze, put it in water and take it out. Run it through two fingers so the excess water comes off, and stick it to your body.
9. Repeat to cover the whole area you want a cast of. Work sequentially from one side to another, and work as fast as possible. How quickly the plaster dries depends on a lot of factors, but mine did that quite fast.
10. You’ll notice at some point that the cast will start feeling loose, that’s a sign it’s drying. I followed the instructions on the plaster gauze so I stood for about a quarter in the bathtub waiting for the cast to be dry enough to be taken off my body.
11. If you want some additional dryness, take out the hairdryer and apply some heat to both the outside and the inside (if you can reach it) of the cast.
12. Gently put the cast somewhere it can dry completely. Depending on thickness, this might take up to 48 hours. Make sure to flip it carefully once one side is dry.
13. Take a good look at your own plaster imprint! You can’t see my smile on the picture but it was quite large.
Notes: the type of plaster gauze varies from manufacturer to manufacturer. I first tried making a cast using rolls from the hobby shop for this tutorial, for my second one I used rolls from the pharmacy. Those were substantially softer before use and harder set after use.
Anne’s Alternative Tests on Getting the Right Wire Trace
Guest Author Post By: Anne Bertha
While some people find their wire shape and size easily, it can prove to be a real challenge for others. There are some other ways you can make this process easier. All the methods have one idea in common: to make a mould of your ribcage so you can decide which wires are the best fit. There’s always a compromise to be made between ease, cost and accuracy.
I will be discussing the pros and cons of three methods: using masking tape, tin foil and making a plaster cast. Finally, I’m showing you my root trace on paper.
First up: masking tape mould.
The idea behind this one is quite simple: by sticking layers of masking tape to your body and carefully peeling it off, you’re able to replicate your wire root shape on paper in 2D.
Notes: You want to make a construction in which your breasts are encased, with kind of like anchor points. Otherwise, when you peel your tape construction off, it will lose its shape.
Pros: Easy and cheap way to get a rough idea of your root shape.
Cons: Can be painful to peel off, depending on the masking tape itself. Because you mould it to your body (3D) and try sticking it to paper (2D) afterwards, it’s not that accurate. It can be quite tricky to figure out how to stick it to paper without distorting the shape.
Second: tin foil mould.
Tin foil has an interesting property: it’s malleable and will hold its shape quite well. I made this one by moulding pieces of tin foil to my body and sticking them together as well as to my body using masking tape.
Notes: Try and keep the mould quite flat. I folded some tin foil, shaped it, but in some places I got a little overexcited and the tin foil piled up. It won’t stick to the masking tape as well then.
Pros: Easy and cheap way. A bit more expensive than the tape mould, but also much more accurate.
Cons: There is a hint of a 3D shape there, but it’s still much more of a 2D shape. You don’t get a clear idea if your ribcage is particularly cylindrical and you might need to bend your wires or not.
Third: plaster cast
For a how-to, read the separate blog post. Because this shape is very 3D, it can be tricky to translate it to paper to get an idea of your wire size and shape. I suggest taking a flexible wire, moulding it to the cast and then scanning that wire.
Pros: Very accurate method to get a 3D mould of your ribcage.
Cons: You need specific materials and, preferably, a second person to make the mould on you. It takes a while to dry so for the impatient ones amongst you, you’ll have to wait at least a day to start working with it.
As you can see above, I only made a plaster cast of half of my ribcage since I didn’t have enough plaster gauze. This root trace on paper is made using the tin foil mould, which was quite easy to translate to paper. Not only does this root trace allow for an accurate way to determine wire size and shape, it also makes it possible to make a custom bridge pattern.
Which method you choose is up to you, they all have their pros and cons and will all help you towards a better wire (and thus bra) fit. If you have additional ideas, suggestions, or want to share how yours turned out, feel free to do so in the comments!
New Bra Sloper Drafting Course
I have been working on my bra sloper drafting course for a few months now and I’m happy to say it is finally done and officially released today. To begin with, let me explain what a sloper is and how you can make one for yourself.
A sloper, by definition, is a block pattern that you create other designs from. In the third edition of my bra drafting book, Bare Essentials: Bras, I introduced a new type of sloper and a new method to manipulate it.
When I released my book, I had envisioned a pattern that would fit nearly everyone (unfortunately not everyone). That pattern became my Eve Classic. Over the past year, I released the Eve Classic in phases and for specific wires and cup shapes. This week I announced my official release of this pattern and am offering the pattern for 50% off for an entire month.
This week I also released a FREE Eve Sloper Creation Class to turn your Eve Classic into a sloper. This is nearly the same method you create your sloper from in my book, but this class has been adjust for a finished pattern, even a different pattern with similar style lines.
Today I announced the official release of my Complete Bra Sloper Drafting Course. This, I’m afraid, is not a free course, but I am offering one of the classes for free as a demonstration of what the full course is about.
Enjoy all my released this week and please share with others who might be interested.
Bending Underwires to Fit the Body
There are times in which you have done the wire trace of your breast root, but when wearing the fitting band, the wire tilts back and digs into your rib cage. This is usually caused by body frames that are more rounded and the wire does not do what you want it to do.
In this case, you may need to bend your wire to fit your body shape better. I did a little video explaining this.
On a quest to determine why the wires were not allowing the bra to fit properly despite her custom draft, Bare Essentials drafter Grace Horne decided to do a plaster cast of her rib cage to show how the wire needs to be shaped to fit her.
The first test is to cut the bridge front with wire out of cardboard and line it up to your body. If the cardboard cutout does something really weird at the side of the breast, you may need to bend your underwires.
These videos were shared by Grace to show her challenges. (Ignore the black box below. WordPress is doing something really strange).
To follow Grace’s work, you can find her at
grace_horne_designs on Instagram and Grace Horne – Knife and Scissor Maker on Facebook.
Bra Drafting Course and Third Edition Update
I have been super busy these days, between back to school, teaching workshops, making patterns and video editing my online courses, I have barely had time to share what I’ve been up to.
I started teaching 3-day workshops at my studio in Florida. They have been wonderful, but so information packed, that it is exhausting. I have two more workshops planned for the remainder of this year and I am thinking that might be all I do. While it has been fun to get back into teaching, I think I would rather utilize my energy to make content that everyone can enjoy, not just the few that can train with me on an individual basis. Next year I may offer one on one training by the day for those who want to pick my brain, but not sure if there will be any takers. Only time will tell. If you are interested in any of the spaces left for this year, my workshops are listed under the books & classes section of my website.
My online course is now live. It covers the basic draft for the band and cup, plus how to create the sloper and manipulate it. I have broken the videos into steps, so some videos are only 30 second long and some are a few minutes. I did it this way so you don’t skip a step. Watch the video, do the step, rinse and repeat. Here is the link to the online course.
I finally did a video announcing the third edition, only 2 months late.
Update on the rest of my life
Summer was a challenge this year. We did not do any camps for Emily, so she was needing our attention nearly full time. Although even when she had camps, I still felt like we were giving her our attention 24/7.
Emily started school a month ago and the direction her class was taking was not agreeable to us, so after about 2 weeks, we pulled her from school and enrolled her in a charter school. I am so glad we did. I have been feeling completely exhausted for months, possibly up to a year and I can now attribute it to Emily’s school. She was clearly unhappy and acted out at home, making us completely drained of all our energy. In the 2 weeks since she has been in this new school, everything has changed. I am no longer exhausted and feel like I can join the productivity train again. I even made it to the gym that I’ve been supporting forever but never go to.
Needless to say, my exhaustion was linked to Emily. Damn me and my empathy. I am back on the band wagon again. I finished my bra drafting online course and made it live a few days ago, but haven’t officially announced it until now.
The Spanish edition of Bare Essentials is almost done. Its just back with the translator to make sure everything looks good. My new pattern set is rounding up testing which I hope to release in about a month. I think that’s all?? But probably not.
My next big projects are to get back to my other unfinished books – one is a sloper drafting book for the Pattern Design series and one is the athletic wear book for the Bare Essentials series. Both books are already partially written, but far from finished. I’ll probably toss a coin to choose which is next, but likely it will be the Pattern Design book since that is fresher in my memory.
Now that a big portion of my projects are completed, I expect to start posting a little more regularly. I also think I have a few guest posts coming up soon. Stay tuned.
Anne’s adventures in bra drafting: from zero bra to hero bra
I am happy to share this guest blog post from Anne Bertha and her adventures in drafting. – Jennifer
My bra making adventure started in June last year. I am a large cup size: the last bras I bought are a European 90H but are still too small in the cup. I read that in a well-fitting bra, the wires should lie flat against your chest. Well, I haven’t had that in years. More like over a decade, actually. And I’m 33… I don’t have to tell you I didn’t know how a bra should fit at all.
I started by replicating the fit I had in store-bought bras using patterns. It was ok, but I kept searching for a way to get those damn wires against my chest. After making multiple sizes of a pattern and still not feeling happy with the fit I achieved, I almost threw the towel in the ring.
That’s the point where I heard about Jennifer’s book! Somebody on Facebook recommended her wide vertical flat wires for me, and from the moment they arrived, I became a huge fan of hers. I instantly bought the book when it came out, and started reading. The larger sized patterns weren’t ready yet, so I had two options: wait for them or draft one myself. Because I’m a slightly impatient person *ahem*, and also because I believed I could as well draft completely after my measurements since I’ve had no success with other patterns, I started the drafting chapter.
It was an early morning when I started drafting after Jennifer’s book, and by 7:30 AM I had the front and back band done. And then the cup drafting started… I made mistakes. A lot of them. Being a newbie to pattern drafting, I didn’t understand what the book was trying to tell me in some steps. That also had to do with my over-excitement and not trying to read and understand properly, I admit.
The first trial bra I made out of calico was from a draft that was wrong in a lot of places, but I kept on adjusting it until I had a reasonable fit. That process taught me a lot. It taught me different types of common adjustments, how curves affect the fit of a bra, what you can do to fix particular fit issues, … I ended up taking my fabric scissors and cutting my cups up a lot to see where I needed more room.
After sewing a bunch of trial cups, I was happy with the fit. I moved on to the sloper, but kept on needing a lot of adjustments. And then I found out I misread some of the steps in the book. Because all of the steps are kind of necessary, not doing a step right has quite an impact your draft. In my head, there was also this little voice that kept saying: “This book has a logical mathematical approach, and it doesn’t work that well for you, you must be doing something wrong!”
So I started over. And oh my god, I couldn’t believe my eyes when I tried on my first newly drafted cups in my tester frame. The fit is almost spot on, I only needed to remove some room around the apex. I pinched that out, pinned, and transferred it to the pattern. It’s like everything came together. Beneath you can see the difference between my first heavily adjusted draft, and the second draft with all errors eliminated. I made a draft for each cup since they are substantially different.
This was the best result I could get with tweaking a ready made pattern. This is, I think, the fifth size I made, and the best overall fit I was able to achieve in my first year of bra-making.
This is my first (wrong) draft after a ton of adjustments:
This is my first draft done correctly:
What stands out to me, is that in the last draft, the horizontal seam is… Well, horizontal! My next step is to work on the new sloper, and make a bra from that which will fit me almost perfectly and is a style that I like in a fabric I like.
I’d recommend anybody who wants to draft their own bra with Jennifer’s method to become a member of the Facebook group ‘Fans of Bare Essentials’. It’s a group dedicated to Jennifer’s method of drafting. If you become a member and get stuck on a step, you can ask for help. You then hopefully won’t end up making a lot of mistakes as I did.
However, if you do make mistakes, don’t beat yourself up. It’s a learning curve, and from doing wrong you learn just as much or even more than from doing everything right. Of course it’s always more fun if you get advice, explanation where needed, and encouragement. That is what the group tries to provide.
I wouldn’t change a thing about my drafting journey. It took me meters of calico, weeks of my sewing time turned into drafting time, but it feels so good to have fathomed a drafting system that works for me. I seriously feel like I’ve learned twice as much in the last month compared to the previous year.
I’ve become a true bra-liever. I didn’t think comfortable, well-fitting bras were made for me, and now I realise I can make them myself.
Anne started sewing just over four years ago, and is completely self-taught except for a few workshops here and there. She remembers her first weeks behind the sewing machine vividly because she always forgot to put the presser foot down. She started with sewing her own clothes, moved on to bags and now finally also bras. Being a physicist and loving mathematics, she found a new exciting challenge in pattern drafting.
A Wire That Fits
I am happy to have the first guest post on my blog written by Jane Ramsey. Jane happily helped me test and experiment with changes for the new bra drafting book. -Jennifer
If you wear an underwired bra you may think the wire is an evil torture device. There are many reasons for this. A wire that pokes you in the armpit, or sternum, that creaks as you breathe, that digs into your ribs, that snaps in two….
All of the above are signs of an incorrectly fitting wire. Too big, too small, too long, too narrow….
Ideally you need to find a bra style that incorporates your best fitting wire. The easiest way is to make your own or have a custom made bra.
There’s a massive range of shapes and sizes of underwire. Short, regular and long. Vertical, flat vertical, regular, demi… this list is not exhaustive.
Then there’s wire size.
The numbering convention is based on the ‘right’ wire for a B cup. So a 40 wire works for a 40B and it’s sister sizes 42A, 38C, 36D, etc. This isn’t an exact science, our bodies don’t conform to these standards. Bra designers don’t always stick to the formula either. This can be a good thing, because we may need different wires even in the same size bra. If you’re making your own bras, or if you are having a custom made bra, finding the perfect wire for you is the best place to start.
For myself and my customers, I have a simple tool, a piece of heavy duty electrical wire, the type used for hard wiring a cooker or shower.
The plastic insulation stripped off, the ends looped round to prevent injury and then the wire bent into the approximate shape of an under wire.
To use, I simply place it in the breast crease, the inter mammary fold, with your arm raised, ensuring it follows the trace of the breast root, without sitting on breast tissue. This gauge of copper wire is malleable, soft enough to bend easily with your fingers, firm enough to hold the shape when you take it off the body.
An added bonus is, you can just flip the wire to check you need the same size wire for both breasts. Most of us are slightly asymmetrical, some of us have a greater degree of asymmetry. Rather than just padding out one cup of a pair of matched cups you might want to make different cups for each side… I digress, that’s a whole other blog post.
Once I have my bent wire, I compare it with printed wire charts to find the best match. There is very little difference between the sizes but the wrong size can dramatically affect your comfort and the fit of your bra. When wearing the right wire, you will barely know it’s there, unless you have other conditions affecting your sensitivity.
Wire fitting. 4 easy steps.
1. Bend the wire to the approximate shape of your breast root. (You can trace the wire in your best fitting bra as a starting point).
2. On your naked body, place the wire in your inter mammary fold, or breast crease.
3. Adjust the shape of the wire so it follows the shape of your breast root. Making sure it doesn’t sit on breast tissue.
4. Match it to your printed wire charts.
This wire trace is clearly bigger than the 40.
The 42 looks pretty close, the bend at the end of the wire was where I bent it so it didn’t poke Kathryn in the armpit.
Yes, all my mannequins have names.
The 44 is too big
Finally I checked against the vertical wires. A regular wire is much more suited to Kathryn. Some people have a wide, flat root, they would benefit from the flat vertical wires, as you can see, this chart is labeled with my best fit wire, a 42 vertical.
Just a reminder, weight fluctuations, water retention, dehydration, even our menstrual cycle can affect our breasts enough to make a wire that’s a perfect fit one day too big or too small another.
All of the wires mentioned above can be bought from www.Porcelynne.com.
Supporting you through the ages, Jane is a dressmaker with decades of experience having started sewing clothes by the time she was 10. She has a passion for historical clothing and the foundation garments that provide the right silhouette for each era and has recently expanded that passion to finding a comfortable bra that fits well.
Announcement of Classes
I taught at a bra making conference this past weekend, and while it was a little overwhelming due to class size, I have decided to start teaching again. I have set up five 3-day workshops to teach pattern drafting and manipulation of bras. The best part is that I am limiting class size to 5 individuals for each class.
I was planning to write this post later this week, but just by announcing it on Instagram and Facebook about an hour ago, I have already started booking classes and I know some of you want to know as soon as they are available.
The class days are all Thursday, Friday and Saturday. That way if you are taking off to come to Florida, you only need to take off 2 days, then enjoy an extra day in the Florida sunshine over the weekend after your class ends on Saturday.
The times are scheduled for 9am to 4pm with lunches and snacks included. We have a cute little neighborhood restaurant called Stone Soup that we like to frequent for lunch. If weather permits, we can walk, but we can easily drive over there in my hubbie’s Highlander.
If you are traveling here, I encourage you to stay at the beach to take in the relaxing atmosphere after classes, but we have hotels and AirB&B nearby too. Take an Uber to my studio and I’ll drive you back at the end of the day. I can also try to coordinate with everyone on their arrival times so one of us could come get you from the airport if you don’t want to deal with a rental. We can work out the details once you start scheduling your travel, but please check with me first before depending on us for airport pickup. I will not drive to the airport after 11pm, as I will be asleep, 10pm is probably pushing it.
Here is the link for the classes:
Feel free to ask me any questions you may have.
Introduction to My New Wires
I finally found a little segment of time to film my introduction to the new vertical flat wires I am carrying. Pardon my appearance. I wasn’t planning of doing the video yesterday, but I saw 15 minutes that were available to me.
This video gives a little detail on the differences of the most standard wires used – regular underwires and vertical underwires. After explaining the differences, I explain why I created the vertical flat. I’m still nailing down which size is most appropriate for me.
In traditional sizing, I am recommended to wear a 54 wire. In my testing, the 52 vertical flat fit well and barely moved on me, but once I was driving, I did feel it moving down a bit. I did not alter the bra pattern. I just switched out the wires, so its probably a combination of the pattern and possibly I need to try the 50 vertical flat.
I named these wires myself because I was the one that created them. I’m still hashing out the recommended bra sizes to wear these, so if you test them out, let me know what size worked for you (as well as what size is recommended for you in traditional charts).
Grading a Bra with PolyPattern
I had intended to hold on to these videos for later publication, but I encountered an issue when I went to do a tutorial on how to digitize with PolyPattern, so I decided to just go ahead and release the videos. They would be a little out of order for anyone who is unfamiliar with the software.
The series I just released I filmed a few months ago when I was grading my California Dreaming Bra. These videos show you how I graded it, then imported it into Illustrator to make them pretty for downloads.
I was planning on doing the digitizing tutorial, then a truing tutorial, a basic drafting a sloper, a bra drafting sloper all within PolyPattern prior to releasing this set. I changed my mind. I wanted to show how easy the software is to use for the grading and converting to download.
If you are interested in this software, you can download the demo version under the Books & Downloads tab. Play around with it and let me know what you think. Once you test it, I can give you access to the pricing info. Its actually not bad compared to other CAD software, I just can’t publish the prices to the world. You need to be a secret agent to get that info. It is in lines with the pricing of Wild Ginger’s Cameo Pattern Design and Grading modules.
I will be doing the videos of everything mentioned above, but I am heading off for the holidays in a few days for a couple weeks, so videos will pick back up in January. Although I did just create a legging pattern from kids aged 18 months through size large in kids. If I can get my butt together and do that video today, that will be the last one before the end of the year. If I don’t get to that today, then I wish you all a Happy Holiday! If I do, I’ll post about it before.