LIMITED TIME ONLY: Use promo code 1WMEMDAY15 for 15% off our limited edition colorways (Chloé Fleur, Siren, and Ivy). This offers ends 5/29 at 11:59pm EST, and cannot be combined with additional offers.

Our Bellows Plunge High-Cut One Piece Swimsuit is the ultimate in flattering swimwear. This suit goes beyond seamless swimwear and features our signature, patent-pending edgeless design, along with a deep V plunge front and back. With a lengthening high-cut leg opening and our cheekiest back coverage, this is an undoubtedly sexy one piece.  Like all of our swim, Bellows Plunge High-Cut One Piece Swimsuit has an inner soft grip strip that keeps it secure without the use of elastic or tight seams. So yes, that deep neckline will stay put! Bellows also has removable cups. The dig-free nature of this one piece (and all of our swim!) also makes this the perfect bodysuit. 

Looking for size advice? onewith now runs true to size. But if you're in-between sizes, size UP! And ALWAYS give your suit a  s t r e t c h  before putting it on. For further guidance, reference our size chart here, which also includes torso measurements for Bellows one piece. 

Looking for our bikinis that fit like underwear? Shop onewith swim two pieces 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% recycled nylon 20% elastane
•  Hand wash only (rinsing in the shower is just fine), lay flat to dry

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 have as much give as your standard no-show underwear. It's super important to STRETCH your suit before each wear, but 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. If you are AT ALL in-between sizes, size UP! 

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!

Some IRL size reference pics for you:

"can I just order a few sizes and styles and return what doesn't fit???"

please don't 🫠🫠🫠🫠 here's why.

⛔ Bracketing + high-quantity first orders are STRONGLY discouraged: while we understand the desire to find your best size(s) and styles, ordering multiple variants of a piece with the intention of returning those that do not fit/suit you creates inventory issues for us as a small business, and also compromises hygiene best practices. We encourage conscious consumerism by way of small, mindful first orders of 1-2 units. While we naturally love when you stock up on your fave swim once you know your best onewith size, please do so mindfully for our other customers' sake (that is, without the intention of returning extra sizes/styles). While this may be more permissible for an enterprise-level company, we ask that you consider how bracketing + large returns affect a small business, its customers, and the environment. Returns of 4 or more pieces/customer will be subject to a processing fee of $15.95 in addition to the return fee.

Bellows One Piece Torso Measurements