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Whether it's for summertime or swimming lessons, your girls need the right gear for when they dive into the water. Check out thredUP's selection of girls' swimwear to discover items from top brands at up to 90% off estimated retail.
1,710 items
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![Unbranded One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/612157272/complimentary.jpg)
![Unbranded One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/612157325/complimentary.jpg)
Unbranded
One Piece Swimsuit
Size 2X-large kids
$12.99 $7.14 45% off with code GOBIG
60% off estimated retail![Assorted Brands Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611252292/complimentary.jpg)
![Assorted Brands Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611252244/complimentary.jpg)
Assorted Brands
Two Piece Swimsuit
Size 12
$16.99 $9.34 45% off with code GOBIG
48% off estimated retail![Assorted Brands One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611867200/complimentary.jpg)
![Assorted Brands One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611867083/complimentary.jpg)
Assorted Brands
One Piece Swimsuit
Size 12
$11.99 $6.59 45% off with code GOBIG
63% off estimated retail![J.Crew Factory Store Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611766390/complimentary.jpg)
![J.Crew Factory Store Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611766329/complimentary.jpg)
J.Crew Factory Store
Two Piece Swimsuit
Size Small youth
$19.99 $10.99 45% off with code GOBIG
52% off estimated retail![Honisen One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610049728/complimentary.jpg)
![Honisen One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610049752/complimentary.jpg)
Honisen
One Piece Swimsuit
Size Medium youth
$9.99 $5.49 45% off with code GOBIG
37% off estimated retail![Justice Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/611343316/complimentary.jpg)
![Justice Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/611343298/complimentary.jpg)
Justice
Swimsuit Cover Up
Size X-Large youth
$16.99 $9.34 45% off with code GOBIG
48% off estimated retail![Gap Kids Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/611046414/complimentary.jpg)
![Gap Kids Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/611046241/complimentary.jpg)
Gap Kids
Swimsuit Cover Up
Size X-Large youth
$19.99 $10.99 45% off with code GOBIG
42% off estimated retail![Ruffle Butts Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/596711587/complimentary.jpg)
![Ruffle Butts Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/596711545/complimentary.jpg)
Ruffle Butts
Swimsuit Cover Up
Size 12-18 mo
$7.99 $4.39 45% off with code GOBIG
27% off estimated retail![Hanna Andersson One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611250584/complimentary.jpg)
![Hanna Andersson One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611250548/complimentary.jpg)
Hanna Andersson
One Piece Swimsuit
Size 90 cm
$26.99 $14.84 45% off with code GOBIG
34% off estimated retail![Tommy Bahama One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611674700/complimentary.jpg)
![Tommy Bahama One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611674655/complimentary.jpg)
Tommy Bahama
One Piece Swimsuit
Size 18 mo
$13.99 $7.69 45% off with code GOBIG
48% off estimated retail![Hanna Andersson One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611251781/complimentary.jpg)
![Hanna Andersson One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611251719/complimentary.jpg)
Hanna Andersson
One Piece Swimsuit
Size 2T
$26.99 $14.84 45% off with code GOBIG
34% off estimated retail![Adidas One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611178064/complimentary.jpg)
![Adidas One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611178029/complimentary.jpg)
Adidas
One Piece Swimsuit
Size X-Small kids
$15.99 $8.79 45% off with code GOBIG
52% off estimated retail![Assorted Brands Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610316787/complimentary.jpg)
![Assorted Brands Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610316705/complimentary.jpg)
Assorted Brands
Two Piece Swimsuit
Size 12-18 mo
$9.99 $5.49 45% off with code GOBIG
54% off estimated retail![Crewcuts Outlet Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611334530/complimentary.jpg)
![Crewcuts Outlet Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611334490/complimentary.jpg)
Crewcuts Outlet
Two Piece Swimsuit
Size 10
$12.99 $7.14 45% off with code GOBIG
48% off estimated retail![Gap Kids One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610578693/complimentary.jpg)
![Gap Kids One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610578582/complimentary.jpg)
Gap Kids
One Piece Swimsuit
Size Small kids
$19.99 $10.99 45% off with code GOBIG
50% off estimated retail![Assorted Brands One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611340114/complimentary.jpg)
![Assorted Brands One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611340059/complimentary.jpg)
Assorted Brands
One Piece Swimsuit
Size 10
$15.99 $8.79 45% off with code GOBIG
51% off estimated retail![OshKosh B'gosh One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610443742/complimentary.jpg)
![OshKosh B'gosh One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610443614/complimentary.jpg)
OshKosh B'gosh
One Piece Swimsuit
Size 9 mo
$12.99 $7.14 45% off with code GOBIG
45% off estimated retail![Cat & Jack Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/610430767/complimentary.jpg)
![Cat & Jack Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/610430636/complimentary.jpg)
Cat & Jack
Swimsuit Cover Up
Size X-Small youth
$9.99 $5.49 45% off with code GOBIG
41% off estimated retail![Nicole Miller New York One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611195248/complimentary.jpg)
![Nicole Miller New York One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611195237/complimentary.jpg)
Nicole Miller New York
One Piece Swimsuit
Size 4
$8.99 $4.94 45% off with code GOBIG
55% off estimated retail![Cat & Jack One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610430942/complimentary.jpg)
![Cat & Jack One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610430895/complimentary.jpg)
Cat & Jack
One Piece Swimsuit
Size Small kids
$9.99 $5.49 45% off with code GOBIG
41% off estimated retail![Ocean Drive Clothing Co. Rash Guard (view 2)](https://cf-assets-thredup.thredup.com/assets/610320459/complimentary.jpg)
![Ocean Drive Clothing Co. Rash Guard (view 1)](https://cf-assets-thredup.thredup.com/assets/610320395/complimentary.jpg)
Ocean Drive Clothing Co.
Rash Guard
Size 5T
$15.99 $8.79 45% off with code GOBIG
40% off estimated retail![OshKosh B'gosh One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610415041/complimentary.jpg)
![OshKosh B'gosh One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610415006/complimentary.jpg)
OshKosh B'gosh
One Piece Swimsuit
Size 12 mo
$9.99 $5.49 45% off with code GOBIG
52% off estimated retail![OshKosh B'gosh One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610293127/complimentary.jpg)
![OshKosh B'gosh One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610292951/complimentary.jpg)
OshKosh B'gosh
One Piece Swimsuit
Size 12 mo
$11.99 $6.59 45% off with code GOBIG
50% off estimated retail![Art Class Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610565782/complimentary.jpg)
![Art Class Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610566004/complimentary.jpg)
Art Class
Two Piece Swimsuit
Size X-Small kids
$11.99 $6.59 45% off with code GOBIG
29% off estimated retail![Assorted Brands One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611034524/complimentary.jpg)
![Assorted Brands One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611034419/complimentary.jpg)
Assorted Brands
One Piece Swimsuit
Size X-Large tots
$11.99 $6.59 45% off with code GOBIG
68% off estimated retail![Hanna Andersson One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611195755/complimentary.jpg)
![Hanna Andersson One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611195726/complimentary.jpg)
Hanna Andersson
One Piece Swimsuit
Size 3
$27.99 $15.39 45% off with code GOBIG
31% off estimated retail