size chart
| Size | Bust | |
|---|---|---|
| XXS | 00 | 30.5 - 32 |
| XS | 0 | 32 - 33.5 |
| S | 2-4 | 33.5 - 35 |
| M | 6-8 | 35 - 37 |
| L | 10-12 | 37 - 39 |
| XL | 14-16 | 39 - 41.5 |
| 2XL | 18-20 | 41.5 - 44 |
| 3XL | 22-24 | 44 - 47 |
| 4XL | 26-28 | 47 - 50.5 |
| Size | Waist | Hips | |
|---|---|---|---|
| XXS | 00 | 23 - 24.5 | 33 - 34.5 |
| XS | 0 | 24.5 - 26 | 34.5 - 36 |
| S | 2-4 | 26 - 27.5 | 36 - 37.5 |
| M | 6-8 | 27.5 - 29.5 | 37.5 - 39.5 |
| L | 10-12 | 29.5 - 31.5 | 39.5 - 41.5 |
| XL | 14-16 | 31.5 - 34.5 | 41.5 - 44 |
| 2XL | 18-20 | 34.5 - 37.5 | 44 - 47 |
| 3XL | 22-24 | 37.5 - 41 | 47 - 50.5 |
| 4XL | 26-28 | 41 - 44.5 | 50.5 - 54 |
| Size | Bust | Waist | Hips | |
|---|---|---|---|---|
| XXS | 00 | 30.5 - 32 | 23 - 24.5 | 33 - 34.5 |
| XS | 0 | 32 - 33.5 | 24.5 - 26 | 34.5 - 36 |
| S | 2-4 | 33.5 - 35 | 26 - 27.5 | 36 - 37.5 |
| M | 6-8 | 35 - 37 | 27.5 - 29.5 | 37.5 - 39.5 |
| L | 10-12 | 37 - 39 | 29.5 - 31.5 | 39.5 - 41.5 |
| XL | 14-16 | 39 - 41.5 | 31.5 - 34.5 | 41.5 - 44 |
| 2X | 18-20 | 41.5 - 44 | 34.5 - 37.5 | 44 - 47 |
| 3X | 22-24 | 44 - 47 | 37.5 - 41 | 47 - 50.5 |
| 4X | 26-28 | 47 - 50.5 | 41 - 44.5 | 50.5 - 54 |
onewith size guide
everyone’s unique, and no quiz can capture every preference or body type — but this is the next best thing to trying on in person.
disclaimer: results are a guide, not a guarantee. fit preferences may vary.
1 FREE exchange on eligible US orders
size inclusive (XXS-4XL)
patented, US Patent No. 12,537,039
See it in your size
important info for when you get your onewith
how to warm up your onewith
this is swimwear unlike anything else on the market, so with that, it has some special instructions to truly get a fit that's onewith your body ✨ 'warming up your onewith’ (aka giving the garment a stretch) is MISSION-CRITICAL to the fits-like-undies vibe. your swim actually SHOULD dig in a bit to start if it’s your proper size. then, with a stretch at the openings, it should fit and feel smooth, like a second skin (and/or your fave seamless undies) 🫧
what to know about sizing
this is swimwear unlike anything else on the market, so with that, it has some special instructions to truly get a fit that's onewith your body ✨ 'warming up your onewith’ (aka giving the garment a stretch) is MISSION-CRITICAL to the fits-like-undies vibe. your swim actually SHOULD dig in a bit to start if it’s your proper size. then, with a stretch at the openings, it should fit and feel smooth, like a second skin (and/or your fave seamless undies) 🫧
can I just order a few sizes and styles and return what doesn't fit?
⛔ Bracketing/high-quantity first orders are 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 creates inventory issues for us as a small business, and also compromises hygiene best practices. We encourage conscious consumerism by way of mindful first orders of 2 styles.