Designed for Every Body: Inside the Brands Redefining Inclusive Swimwear Sizing
Body Positivity
April 06, 2026
By Rachel Kius
Image Credit:Eloquii
At MySwimLook, we carefully research and curate swimwear selections to bring you the best options for every body type, promoting confidence and body positivity. Please note that we may earn a commission if you purchase through our links. Learn more about our methodology and business model here.
Inclusive swimwear sizing goes deeper than adding a 3X. We looked at the brands engineering real fit — from adaptive closures to pattern-graded cuts — and picked the pieces worth your money.
Most swimwear brands treat inclusive swimwear sizing like a box to check — tack a few extra sizes onto the existing range, scale up the same pattern, and call it a day. The result? Suits that technically come in your size but weren't actually designed for your body. I've spent some time digging into what real inclusive swimwear looks like, and the difference starts at the pattern table, not the marketing deck. It means rethinking construction for how different bodies actually move, sit, and swim — from graded patterns that shift proportions across sizes to adaptive closures that work for bodies with different mobility needs. I came back with five brands that are engineering fit from the ground up, plus a checklist so you can evaluate any brand's claims for yourself.
Key Takeaways
01Pattern grading beats scaling
Truly inclusive swimwear sizing redesigns the pattern at each size point — adjusting torso length, bust placement, and hip curve instead of just making the same suit bigger.
02Adaptive features are the next frontier
Magnetic closures, one-hand adjustable straps, seated-wear construction, and sensory-friendly flat seams are making swim more functional for every body.
03Five brands leading with design-first inclusivity
Baiia, Kitty and Vibe, TomboyX, Alpine Butterfly Swim, and Eloquii each bring a different philosophy to inclusive design — from custom butt sizing to made-to-order construction.
04Know how to spot the real thing
Our fit checklist helps you evaluate any brand's inclusive claims before you buy — check the size chart increments, construction details, and model diversity.
What "Inclusive Sizing" Actually Means in Swim Design
Image Credit:@anna.krylova
Image Credit:Kitty and Vibe
Image Credit:Alpine Butterfly Swim
Here's the uncomfortable truth about most size-inclusive swim lines: they're the same suit, just bigger. A standard pattern gets mathematically scaled, which means the proportions that work at a size 4 — torso length, bust point, hip curve — are simply enlarged. The result is a suit that technically fits around you but doesn't fit you.
Pattern grading is the fix. It's the process of redrafting a garment at each size, adjusting not just width and length but the placement of seams, darts, and structural elements. A graded size 20 has a different rise, a different bust apex, and a different hip curve than a scaled-up size 4. It's more expensive to produce, which is exactly why so few brands bother — but it's the difference between "available in your size" and "designed for your body."
Then there's adaptive swimwear — a category that's still emerging but growing fast. Magnetic closures instead of hooks. Adjustable straps with one-hand operation. Seated-wear construction for wheelchair users. Sensory-friendly fabrics with flat seams. These aren't niche accommodations — they're design innovations that make swim more functional for everyone.
5 Brands Engineering Fit from the Pattern Up
These five labels aren't just adding sizes — they're rethinking how swimwear is built. Each brings a different philosophy to inclusive design, from custom butt sizing to gender-neutral construction, and I picked two standout pieces from each.
Baiia Swim
Baiia Swim is an Australian label built around the idea that swim should adapt to your life, not the other way around. Their pieces are reversible — doubling your options per piece — and the line includes period-proof technology , a genuinely adaptive feature that most swim brands ignore entirely. Sizes run 0–22, with wrap-style tops that let you customize coverage and cinch.
Betty One-Piece Wrap Top & Betty Reversible Bikini Bottoms
Image Credit:Baiia Swim
Image Credit:Baiia Swim
Image Credit:Baiia Swim
Image Credit:Baiia Swim
The Betty is a 4-in-1 system that I keep coming back to. A reversible wrap top in red gingham and vintage floral with sculpting support and personalized cinching, paired with reversible bottoms that feature binding at the leg openings for a held-in fit. The cinch adjusts, the pattern flips — one suit, four looks, and it actually works across different body days.
Valencia Long Sleeve Swim Wrap Top & Valencia Reversible Bikini Bottoms
Image Credit:Baiia Swim
Image Credit:Baiia Swim
Image Credit:Baiia Swim
Image Credit:Baiia Swim
For anyone who wants coverage without sacrificing style, the Valencia is it. A buttery-soft long-sleeve wrap in warm coffee-and-black stripes that works as swim or a casual cover-up, with reversible bottoms in bold stripe-on-stripe. The long-sleeve construction isn't just about modesty or sun protection — it's a design choice that signals Baiia is thinking about all the ways people actually wear swim.
Kitty and Vibe
Kitty and Vibe built their entire brand around a deceptively simple insight: butts come in different sizes at the same hip measurement. Their sizing system offers two coverage options per hip size, plus cup-specific tops with small-band options for DDD/E+ — a level of fit customization that most brands don't even attempt. Sizes span XS to 6X, and the price point ($36–$78) makes the fit innovation accessible.
Banded Triangle Top in Blue Floral & High Hip Crossover Bottoms in Blue Floral
Image Credit:Kitty and Vibe
Image Credit:Kitty and Vibe
Image Credit:Kitty and Vibe
Image Credit:Kitty and Vibe
This is the set that made me understand what Kitty and Vibe is actually doing. The triangle top has a plunging neckline with underbust elastic and adjustable straps — including small-band options for bigger cups. The high-hip crossover bottoms feature a thick, soft waistband and medium coverage, and you choose your booty size independently of your hip size. Blue-and-white floral that reads classic, but the engineering underneath is anything but.
Strapless Ruched One Piece in Meadow
Image Credit:Kitty and Vibe
Image Credit:Kitty and Vibe
Image Credit:Kitty and Vibe
Image Credit:Kitty and Vibe
Most brands don't even attempt strapless above an XL. Kitty and Vibe engineered this to stay put through 6X — center ruching that smooths without digging, non-slip grip, removable pads, and an adjustable chest opening. The meadow-green polka dot reads fun and confident, but it's the strapless architecture that genuinely impresses.
TomboyX
TomboyX started with underwear and pivoted hard into swim with a gender-inclusive, comfort-first philosophy. Their pieces use recycled polyester (OEKO-TEX certified), feature UPF 50 protection, and come in styles that deliberately sidestep the bikini-or-one-piece binary. Sizes range from XS to 4X, with tucking options and swim shorts that give people more choices about how much they want to show.
Swim Tucking One-Piece - Palm Dreams
Image Credit:TomboyX
Image Credit:TomboyX
Image Credit:TomboyX
Image Credit:TomboyX
This stopped me mid-scroll. An integrated power mesh panel for stomach smoothing, a scoop front, low back, and flatlock seams that prevent chafing — plus tucking functionality that makes this one of the few swim pieces designed with trans women specifically in mind. The dark tropical palm print in blues and reds feels editorial, not medical. That distinction matters.
Swim Solarmesh Peekaboo Top - Red & Swim Solarmesh 4.5" Shorts - Red
Image Credit:TomboyX
Image Credit:TomboyX
Image Credit:TomboyX
Image Credit:TomboyX
The Solarmesh fabric is made from recycled water bottles — five per top, seven per short — and it's breathable, moisture-wicking, and chlorine-resistant. The peekaboo cutout on the crop top adds a design moment without sacrificing coverage, and the 4.5-inch shorts hit mid-thigh in a sporty, active silhouette. Swim that doesn't care about gender norms. The coral-red doesn't hurt either.
Alpine Butterfly Swim
Alpine Butterfly Swim is a Venice Beach label founded by Colombian designer Olga Phillips, producing made-to-order pieces in Los Angeles with a zero-waste ethos. The size range goes up to 6X, and the made-to-order model means each piece is cut for the person who ordered it — not pulled from a shelf of pre-made sizes. Prices run $97–$180 for core swim.
Muse Top in Polka Dot & Muse Bottom in Polka Dot
Image Credit:Alpine Butterfly Swim
Image Credit:Alpine Butterfly Swim
Image Credit:Alpine Butterfly Swim
Image Credit:Alpine Butterfly Swim
A triangle halter top with pink ruffle trim and glossy stretch swim fabric, cut-to-sew in their LA studio. The adjustable halter and back ties let you dial in the fit, and it's double-lined for comfort. The matching ruffle-trim bottom has a mid-rise silhouette in black-and-white polka dot with baby-pink edges — retro-femme from XS to 6X, handmade to your order.
Goldie
Image Credit:Alpine Butterfly Swim
Image Credit:Alpine Butterfly Swim
Image Credit:Alpine Butterfly Swim
Image Credit:Alpine Butterfly Swim
I fell hard for this one. An off-shoulder one-piece with adjustable bow ties at each shoulder, a ruffled neckline detail, and a Brazilian-cut bottom. The pumpkin-spice terracotta color and dramatic ruffle construction give it a fashion-forward edge that you don't typically see in extended sizing — which is exactly Alpine Butterfly's point. Available XS to 6X, made to order.
Eloquii
Eloquii started as The Limited's plus-size experiment in 2011, was shuttered, then bought back by former employees in 2014 and relaunched as an independent brand. After a $100M acquisition by Walmart in 2018 and later sale to FullBeauty Brands, they've built a reputation for trend-forward plus-size fashion — and their swim line brings that same design ambition to the pool. Sizes 14–32, with structured construction (underwire, boning) that most swim brands skip above a size 18.
Eloquii Bustier Swim Top & Ruched Highwaist Bottom
Image Credit:Eloquii
Image Credit:Eloquii
Image Credit:Eloquii
Image Credit:Eloquii
Lingerie-inspired with underwire support, foam bra cups, adjustable straps, and a hook-and-eye closure — in swim tricot, in sizes 14 to 32. The high-waist ruched bottom sits at the natural waist and creates a vintage silhouette. The cream-and-coral botanical print reads resort-editorial, not "plus-size section." This is the kind of structured construction that most brands reserve for straight sizes.
Eloquii Rosette Halter One Piece
A bold 3D rosette at the neckline makes this more fashion statement than basic swimsuit. The halter tie is functional, the stretch swim tricot is 82% nylon / 18% spandex, and it's fully lined. Sized 14–32 in a warm coral-pink that photographs beautifully poolside. At $130, it's competitive with straight-size designer one-pieces — and that's the whole point.
The Fit Checklist: How to Evaluate Inclusive Swimwear Before You Buy
Not every brand that says "size-inclusive" actually engineers for it. Here's how to tell the difference before you add to cart.
Check the size chart, not just the range. A brand offering XS–4X means nothing if the measurements jump inconsistently between sizes. Look for graded increments — roughly 1–2 inches between sizes across bust, waist, and hip. Irregular jumps suggest scaled patterns, not graded ones.
Read the construction details. Words like "double-lined," "boned," "underwire," and "power mesh" signal structural engineering. If the product description is the same across all sizes — just with different measurements — the design probably is too.
Look at the model diversity in product photos. Brands that genuinely design for inclusive sizing show their pieces on multiple body types, not one model per colorway. Check if the size the model wears is listed (brands like Kitty and Vibe do this). If every model is a size S, the brand isn't testing fit across their full range.
Check the return policy. A generous return window — 30+ days, free returns — signals a brand that's confident in their fit. Restrictive return policies on swimwear can mean the brand knows their sizing is inconsistent.
Do the fit test at home. Sit down, bend over, raise your arms. Inclusive swimwear should pass the movement test — no riding up, no digging, no gaps. If a suit only looks good standing still in front of a mirror, it wasn't designed for how you actually live in it.
Our Final Take
Inclusive swimwear sizing isn't a marketing badge — it's a design decision that starts at the pattern table and shows up in every seam, closure, and size-specific adjustment. The five brands here are doing it differently: Kitty and Vibe with their butt-sized bottoms and cup-specific tops, TomboyX with gender-inclusive swim built from recycled materials, Baiia with reversible period-proof construction, Alpine Butterfly with made-to-order pieces up to 6X, and Eloquii with structured, trend-forward swim in sizes 14–32. If you take one thing from this guide, make it the fit checklist — because every body deserves swimwear that was actually designed for it, not just scaled to fit.
Frequently Asked Questions
01What's the difference between extended sizing and inclusive sizing in swimwear?
Extended sizing scales up an existing pattern. Inclusive sizing redesigns the pattern at each size point, adjusting proportions like torso length, bust placement, and hip curve. The difference is whether the garment was designed for that size or just made available in it.
02What are adaptive swimwear features and who are they for?
Adaptive swimwear includes magnetic closures, one-hand adjustable straps, seated-wear construction, flat seams for sensory sensitivity, and tucking panels. Originally designed for people with disabilities, many adaptive features improve comfort for everyone.
03Which swimwear brands offer the widest size range?
Kitty and Vibe and Alpine Butterfly Swim both go up to 6X with additional customization. Eloquii covers sizes 14–32 with structured construction. TomboyX offers XS–4X with gender-inclusive options.
04How should inclusive swimwear fit differently from standard sizing?
It shouldn't feel different — that's the point. Properly graded inclusive swimwear fits with the same comfort at a 2X as at an XS. If a larger size feels like a compromised version of the smaller one, the brand isn't grading properly.
05Is size-inclusive swimwear more expensive?
Not necessarily. Kitty and Vibe starts at $36, Alpine Butterfly runs $97–$180, and Baiia $119–$179 — all in line with comparable non-inclusive designer swim. Pattern grading costs more to produce, but committed brands absorb it rather than charging a plus-size tax.