SwimHer
Why it's first
Makes its own extended teen sizes
- Bridges girls' sizes straight into teen plus
- Stocks its own sizes, far less “sold out”
- Age-appropriate coverage, mix-and-match
- One brand's styles; small-batch runs
Junior plus size swimsuits, for the teen who's outgrown girls' sizes
When she's past the girls' chart but a straight women's size doesn't fit her frame, junior and young-women's plus is the answer. These are the brands that cut 1X to 3X for a teen body, with notes on how each runs and links to live stock.
Short answer, the brands that fit a teen body:
SwimHer and Aerie for mix-and-match, Torrid for trend-forward young-women's plus, and Lands' End for modest 1X to 3X.
Prefer more coverage? We flag modest, higher-coverage styles (rash guards, swim shorts, full one-pieces) on every list.
Where to buy junior plus swim
Mix-and-match tops and bottoms are the secret here, so most of these let you size them separately.
Aerie
Hidden category
Aerie Swim, separate tops & bottoms (to XXL+)
- Buy top and bottom in different sizes
- On-trend styles teens actually want
- Frequent BOGO swim deals
- Some cuts skimpy; filter for coverage
Torrid
Hidden category
Young-women's plus swim (sizes 10–30)
- Built entirely for plus bodies; true fit
- Strong bust support, trend styles
- Tops, bottoms, one-pieces sized separately
- Styled for older teens/adults; premium price
Old Navy
Hidden category
Women's Plus Swim (1X–4X)
- Cheap, trendy, huge style range
- Separates and one-pieces both in plus
- Frequent sitewide sales
- Adult cuts; check coverage for younger teens
Lands' End
Hidden category
Women's Plus Swim, 1X–3X, UPF 50
- Highest-coverage, modest cuts and swim shorts
- Long torso, true UPF 50, durable fabric
- Mix-and-match by exact size
- Classic styling; higher price
Amazon
Hidden category
“Junior plus size swimsuits”
- Biggest selection across every price point
- Fast Prime delivery before a trip
- Filter by size; read recent fit reviews
- Seller sizing varies; check reviews first
Buttons open each brand's live results in a new tab. We don't hold inventory; prices and stock are set by each store.
From girls' 20 to junior plus, made simple
The jump from the kids' chart into junior or women's plus trips up almost everyone. Here's the map.
Girls' 20 is the end of the kids' chart
After it, brands switch you to letters: junior or women's 1X, 2X, 3X. A girls' 20 lands near a women's XL or 1X, but only measurements confirm it.
Junior plus runs shorter and straighter
Best for a younger teen. Aerie and Torrid sit here. Less bust shaping, more youthful styling.
Women's plus runs longer with more shape
Old Navy and Lands' End. Better for a developed teen with a longer torso and fuller bust.
Still in the kids' range? Start with the girls size 18 guide or plus swimwear for tweens.
Junior plus swim: questions answered
What size comes after girls' size 20?
After girls' 20 (the top of the kids' chart), the next step is junior or women's plus, usually 1X, 2X, 3X. A girls' 20 roughly bridges into a women's XL or 1X depending on the brand. Measure chest, waist and hip and match the brand's chart rather than guessing from the girls' number.
Is junior plus the same as women's plus?
They overlap but are cut differently. Junior plus is shaped for a younger, often shorter and straighter teen figure, while women's plus assumes a fuller bust and hip and a longer torso. Aerie and Torrid lean junior; Old Navy and Lands' End lean women's. For an in-between teen, try both and keep what fits the torso length best.
Where can I find junior plus tankinis?
Aerie, Lands' End and Torrid all sell tankini tops and bottoms separately, which is ideal for a teen whose top and bottom sizes differ. Mix-and-match is the single best trick for the junior plus body, because you almost never fit one straight number top to bottom.
Are there modest junior plus options?
Yes. Lands' End and SwimHer both offer higher-coverage one-pieces, swim shorts and longer tops in junior and teen plus sizes. For full coverage plus sun protection, look at long-sleeve rash-guard sets. See our modest swimsuits guide.