Strapless, sheer, off the shoulder—so many dress styles can feel off-limits when you can’t find a strapless bra that actually works for big boobs.
But not anymore! That’s right, folks—we have cracked the code on sewing strapless bras for big boobs! Meet the Symmes Strapless Bra, our newest bra pattern designed to lift you up sans straps.
With the Symmes, you can say goodbye to slipping, digging, and discomfort—and hello to a whole new world of wardrobe possibilities. And best of all, you can get it for free! Keep reading to learn how.
At Cashmerette, we’re obsessed with figuring out the very best way to support big boobs. Years of development brought you our best-selling underwired Willowdale Bra and the wireless Loftus Bralette, but we knew we had to tackle the ultimate challenge: a strapless bra. It took a long time, and many, many hilariously bad early muslins, but trust us—the final thing is a wonder to behold.
Available in sizes 28C-54J, the Symmes Strapless Bra is built for real support—no slipping, no digging, just a secure fit that’s more comfortable than any strapless bra you’ll find in stores. It’s a game-changer for your wardrobe, opening up so many new styling possibilities!
Rachel is wearing a Symmes Strapless Bra in a size 38I made out of an African wax print with a matching Gilmore Skirt (a Cashmerette Club pattern) with a hacked scallop bound hem. Her measurements are 48″ (122 cm) full bust and 38″ (96.5 cm) underbust.
Brit is wearing a Symmes Strapless Bra in a size 30I made out of a cotton Tana Lawn. Her measurements are 40″ (101.5 cm) full bust and 30.5″ (77.5 cm) underbust.
Jenny is wearing a Symmes Strapless Bra in a size 38I made out of a rayon sateen. Her measurements are 48″ (122 cm) full bust and 38″ (96.5 cm) underbust.
A strapless bra that actually works for large busts
The Symmes strapless bra is cleverly built for heavy-duty support, with multiple layers and design features which work together to create great lift and shaping, even for the largest busts.
With the Symmes, you can expect:
→ Fantastic fit for big boobs
- 14 band sizes and 9 cup sizes for a total of 126 separate sizes—all included!
- A comprehensive bra fitting guide to help you select your best size and refine the fit even further
→ Cups that lift you up
- 4-piece cups with vertical seaming
- Fully enclosed boning along each seamline for shape and support
- Soft, inner foam lining for smoothness and further support
- Optional boning along the top edge
- Optional cup lining for ultra comfort
→ A band that has your back (and front)
- Angled boning in the front and back band
- 2-piece front bridge for a secure and flexible fit
- 3/4″ elastic along the top and bottom edge for a reliable hold
- Wide powermesh back band for additional stability
The Symmes is rated advanced, but with our detailed illustrated instructions and free step-by-step video sewalong (hosted by our very own Jen!), even less experienced bra sewists can tackle this project with ease!
Here is the Symmes bra worn inside out (without cup lining):
A strapless bra that’s uniquely yours
One of our favorite things about bra making is having the creative freedom to choose fabrics that fit your personal style—especially when the options in ready-to-wear are so limited in larger cup sizes. The Symmes is designed for non-stretch woven fabrics such as cotton or rayon, or bra fabric such as duoplex. You’ll also need lining, bra foam, powermesh, and several bra-making supplies like boning, elastic, and underwires. (See the full supply list here.)
Sourcing bra-making supplies can be a challenge, but we’ve made sourcing materials for your first Symmes beyond simple! We’ve once again partnered up with specialist bra supply stores around the world to bring you 20+ gorgeous Symmes kits. These kits are designed specifically for the Symmes (pattern not included in kits) and are sold and shipped by the shops from their websites.
Fantastic fit awaits you!
Every body is unique in its own way, meaning a strapless bra will fit differently depending on who’s wearing it. Our free bra fitting guide walks you through an abundance of custom adjustments to help you discover the right fit with your Symmes.
This isn’t just another bra pattern—it’s a breakthrough for big-boob support!
Sew your own strapless bra today!
The Symmes Strapless Bra is part of our Cashmerette Collection, which means it’s available for purchase individually as a standalone pattern, no membership required!
But we also have a special offer for you! Join Cashmerette Club at our most popular All Access level by May 31st, and you can get the Symmes Bra for FREE—as well as over 50 sewing patterns, a whole library of fit masterclasses and much, much more over your year of membership.
The Symmes is rewriting the rules when it comes to strapless bras and big boobs. We can’t wait for you to get your hands on this pattern—your wardrobe will never be the same!
We love to see what you’re working on. Don’t forget to tag us with #SymmesBra and #Cashmerette on social media so we can see your stunning new strapless bras!
It always surprises me just how generous Cashmerette is, trust me when I say you can’t go wrong with a subscription to the All Access membership. Just as an example I purchased a custom made corset, 20-years ago just to wear a strapless gown to a Ball. You will never be judged, always welcomed and be rewarded with clothes that fit. It’s game changing.
Looks amazing! Still making toile’s and new bra’s for the Willowdale bra and Roseclair Wrap Dress, but looking forward to buying this patter to help with evening wear. Just wish I had it 25+ years ago! Looks like a great development, well done Jenny and the whole Casmerette team.