Protect your order from damage, loss, or theft during shipping.
read all about Shipping Protection and what it covers, here.
- Garment imported from China
- Designed in USA, patent-pending
- Soft, flexible inner grip strip to keep the suit secure
- LATEX INFORMATION: we can not guarantee that the inner grip strip inside of our suits does not contain trace amounts of latex. Therefore, if you have a latex sensitivity or allergy, we recommend you exercising the same caution and sensibilities you would take in general when determining whether or not to use or wear a product that may contain latex.
- Dig-free, elastic-free, edgeless smoothing laser-cut construction, just like your fave undies
- 80% nylon 20% elastane
- Hand wash only (rinsing in the shower is just fine), lay flat to dry
Ready to find your perfect onewith fit? Just click the 'Take the 'find my size quiz' here' button on any product page, answer a few simple questions. Once completed, your best size will populate, tailored to each and every style on our site for all our products as you continue to shop. 🎉
Now, remember—everyone's unique, and preferences, along with the human body, are more dynamic than any size chart or quiz could ever capture. That being said, our sizing quiz is the next best thing to actually trying on our suits in person 😉🔍
Disclaimer: While we strive to provide the most accurate sizing guidance possible, please note that individual fit preferences and proportions may (read: WILL) vary. Buying the size that the size quiz suggests does not guarantee your fit.
If you have any further questions or concerns, our dedicated customer support team is always here to assist you (chat us, DM us, email us, etc!) and, we offer 1 free courtesy exchange on eligible orders 🩵 read our full return/exchange policy here.
| SIZE | BUST | WAIST | HIPS | |
| XXS | 00 | 30 -31 | 22-23 | 33-34 |
| XS | 0 | 32 - 33 | 24 - 25 | 35 - 36 |
| S | 2-4 | 34 - 35 | 26 - 27 | 37 - 38 |
| M | 6-8 | 36 - 37 | 28 - 29 | 39 - 40 |
| L | 10-12 | 38 - 39 | 30 - 31 | 41 - 42 |
| XL | 14-16 | 39 - 41 | 32 - 34 | 43 - 45 |
| 2X | 18-20 | 42 - 44 | 35 - 37 | 46 - 49 |
| 3X | 22-24 | 45 - 48 | 38 - 41 | 50 - 52 |
| 4X | 26-28 | 49 - 52 | 42 - 45 | 53 - 55 |
Bellows One Piece Torso Measurements
| SIZE | INCHES - shoulder to crotch, relaxed | |
| XS | 24.25 | |
| S | 25 | |
| M | 26.75 | |
| L | 27.25 | |
| XL | 28 | |
| 2X | 28.75 | |
| 3X | 30.75 | |
| 4X | 31.25 | |
When sized and stretched properly, onewith will NOT dig in. Remember: you're a human being, and bodies are so much more dynamic than just numbers on a size chart. DM us if you want further guidance on best size!
NOTE: Do NOT expect our suits to be IDENTICAL to no-show underwear in fit. Do note that our suits do not have the same amount of stretchiness of standard no-show panty due to the inner grip strip & bonding.
Looking for cup sizes? We don't size by cup! Go with the measurement of the fullest part of your bust, and reference the Bust section of the chart. Or, shortcut alert 📣 order the same size you would for a camisole/tight tank!
"can I just order a few sizes and styles and return what doesn't fit???"
please don't 🫠🫠🫠🫠 read about high volume returns here. (hint: we charge additional return fees for this! it's not great for our small business, the environment, and other customers ☹️)
Some IRL size reference pics for you:
Shipping Protection
- Unit price
- /per
🤨 need more guidance on what size to choose? chat us! our team of fit experts will help you! 💬
see it on 👀
see our size guide/take our sizing quiz for sizing tips!
80% nylon, 20% elastane
have questions? email or DM us!
FREE shipping on all US orders over $85
secure payment
‼️ enter code SURPRISE at checkout for a secret discount 👀
Adding product to your cart
Protect your order from damage, loss, or theft during shipping.
read all about Shipping Protection and what it covers, here.
- Garment imported from China
- Designed in USA, patent-pending
- Soft, flexible inner grip strip to keep the suit secure
- LATEX INFORMATION: we can not guarantee that the inner grip strip inside of our suits does not contain trace amounts of latex. Therefore, if you have a latex sensitivity or allergy, we recommend you exercising the same caution and sensibilities you would take in general when determining whether or not to use or wear a product that may contain latex.
- Dig-free, elastic-free, edgeless smoothing laser-cut construction, just like your fave undies
- 80% nylon 20% elastane
- Hand wash only (rinsing in the shower is just fine), lay flat to dry
Ready to find your perfect onewith fit? Just click the 'Take the 'find my size quiz' here' button on any product page, answer a few simple questions. Once completed, your best size will populate, tailored to each and every style on our site for all our products as you continue to shop. 🎉
Now, remember—everyone's unique, and preferences, along with the human body, are more dynamic than any size chart or quiz could ever capture. That being said, our sizing quiz is the next best thing to actually trying on our suits in person 😉🔍
Disclaimer: While we strive to provide the most accurate sizing guidance possible, please note that individual fit preferences and proportions may (read: WILL) vary. Buying the size that the size quiz suggests does not guarantee your fit.
If you have any further questions or concerns, our dedicated customer support team is always here to assist you (chat us, DM us, email us, etc!) and, we offer 1 free courtesy exchange on eligible orders 🩵 read our full return/exchange policy here.
| SIZE | BUST | WAIST | HIPS | |
| XXS | 00 | 30 -31 | 22-23 | 33-34 |
| XS | 0 | 32 - 33 | 24 - 25 | 35 - 36 |
| S | 2-4 | 34 - 35 | 26 - 27 | 37 - 38 |
| M | 6-8 | 36 - 37 | 28 - 29 | 39 - 40 |
| L | 10-12 | 38 - 39 | 30 - 31 | 41 - 42 |
| XL | 14-16 | 39 - 41 | 32 - 34 | 43 - 45 |
| 2X | 18-20 | 42 - 44 | 35 - 37 | 46 - 49 |
| 3X | 22-24 | 45 - 48 | 38 - 41 | 50 - 52 |
| 4X | 26-28 | 49 - 52 | 42 - 45 | 53 - 55 |
Bellows One Piece Torso Measurements
| SIZE | INCHES - shoulder to crotch, relaxed | |
| XS | 24.25 | |
| S | 25 | |
| M | 26.75 | |
| L | 27.25 | |
| XL | 28 | |
| 2X | 28.75 | |
| 3X | 30.75 | |
| 4X | 31.25 | |
When sized and stretched properly, onewith will NOT dig in. Remember: you're a human being, and bodies are so much more dynamic than just numbers on a size chart. DM us if you want further guidance on best size!
NOTE: Do NOT expect our suits to be IDENTICAL to no-show underwear in fit. Do note that our suits do not have the same amount of stretchiness of standard no-show panty due to the inner grip strip & bonding.
Looking for cup sizes? We don't size by cup! Go with the measurement of the fullest part of your bust, and reference the Bust section of the chart. Or, shortcut alert 📣 order the same size you would for a camisole/tight tank!
"can I just order a few sizes and styles and return what doesn't fit???"
please don't 🫠🫠🫠🫠 read about high volume returns here. (hint: we charge additional return fees for this! it's not great for our small business, the environment, and other customers ☹️)
Some IRL size reference pics for you: