Best Midsize Swimwear: A Guide to Finding Your Perfect Swimsuit Fit

Shopping for swimwear shouldn't feel like a guessing game, but as a swimsuit brand doing things a little differently, we know just how hard it can be. If you've ever found yourself between sizes, struggled to find enough support, or felt like a swimsuit was designed for someone else's body, you're not alone.

Welcome to onewith: we changed swimwear so women don't feel the need to change themselves. Every woman deserves swimwear that feels comfortable, supportive, and confidence-boosting. That's why our swimsuits that fits like underwear^® are available in sizes XXS-3XL, with thoughtfully designed styles that flatter all kinds of body shapes, proportions, and personal preferences.

The Best Swimsuit Fits Less Like Traditional Swimwear, and More Like Your Favorite No-Show Underwear

Have you ever wondered why your favorite pair of no-show underwear feels so comfortable, but the second you put on a swimsuit, everything seems to dig and squeeze?

Traditional swimwear comes with tight elastic, bulky seams, and constant adjusting throughout the day. We knew there was a better way.

That's why onewith created swimwear that fits like your favorite no-show undies! Our patented construction lies flat against your body like a second skin. We ditched the tight seams and bulky elastic, creating swimwear that moves with you, so you can focus on enjoying the moment instead of adjusting your suit.

How to Find the Best Midsize Swimsuit

When shopping for midsize bathing suits, there are a few things worth considering:

• Bikini tops with adjustable ties or straps (you can't go wrong with any of our bikini tops!)
• Support that works for your bust size (hello, Melba!)
• Coverage options based on your personal preference (for more booty coverage, go with the Compo hipster bikini bottom. For less booty coverage, our Penfield thong bikini bottom is your girl!)
• Bikini bottoms that don't dig in or squeeze (literally all of our dig-free, edgeless bikini bottoms.) 
  

Our swimwear is designed to work with your body, not against it. Whether you prefer a bikini or a one-piece, the best midsize swimwear should feel comfortable from the moment you put it on, and stay in place each and every wear.

We Make Finding Your Size Easy

One of the biggest challenges of shopping for swimwear online is figuring out what size to order.

That's why every onewith product page includes our Size Quiz. It uses your measurements, customer feedback, and details about the specific style you're shopping to recommend the size that's most likely to fit you best.

While no online sizing tool can guarantee a perfect fit (every body is unique, after all), our quiz takes much of the guesswork out of the process and helps you shop with more confidence.

Looking for Tummy Control?

If tummy support is high on your wishlist, we recommend:

• Penfield High-Waisted Thong Bikini Bottom
• Jennings V-Cut High-Waisted Bikini Bottom
• Bellows Plunge High-Cut One Piece (Bellows really is that girl; see our press blog for all features of this ultra-flattering one piece swimsuit!)

These styles offer gentle smoothing and support while still feeling comfortable enough for a full day at the beach or pool.

Remember: tummy control in a swimsuit doesn't mean sacrificing comfort. The right swimsuit should help you feel secure, not restricted.

Find Your Perfect Midsize Swimsuit

The best midsize swimwear is the swimwear that helps you feel confident, comfortable, and completely yourself.

With inclusive sizing from XXS-3XL, adjustable bikini styles, supportive swimsuit construction, and an easy-to-use Size Quiz, onewith makes finding your perfect fit simpler than ever. Still not sure which style or size is right for you? Our sizing experts are always happy to help, and we offer one courtesy exchange per eligible U.S. order so you can shop with confidence.

Every body is different, and your swimsuit should celebrate that. Check out our collection of size-inclusive swimsuits here, and be sure to follow along on IG for all updates in the world of onewith swim.