Target
Cat & Jack Girls' Size 16
Widest selection and lowest price; size 16 is core range, so styles and stock are strong through early summer.
Girls size 16 swimsuit: the last easy size before the gap
Size 16 is usually the top of the normal kids' rack, so it's still findable, but it goes fast and 18 is right behind it. Here's who carries size 16 now, plus a heads-up on where to look the moment she sizes up.
Already eyeing size 18?
Bookmark the girls size 18 & XXL guide now, because 18 is where “sold out” begins and knowing the sources early saves the summer.
Prefer more coverage? We flag modest, higher-coverage styles (rash guards, swim shorts, full one-pieces) on every list.
Where to buy a girls size 16 swimsuit
Size 16 is still on most major kids' racks. These keep it in stock most reliably.
The Children's Place
Size 16 swim (Sugar & Jade tween)
Trend-forward tween styles and frequent sales, and they extend past 16 into 18 to 22 when she grows.
Walmart
Wonder Nation Girls Size 16
Lowest price and in stock most of the season, with coverups and matching pieces to 16.
Lands' End
Girls' Size 16, UPF 50, modest cuts
Durable fabric, true UPF 50 and longer-torso cuts, with mix-and-match tankinis sized separately.
Amazon
“Girls size 16 swimsuit”
Biggest selection across every style and price, with fast Prime delivery. Read recent reviews for true fit.
Size 16 questions, answered
Is girls' size 16 the last regular kids' size?
Almost. Most brands run girls' 7 to 16 as their core range and stock it well, so 16 is often the last size on a normal rack. A few go to 18 or 20, but availability drops sharply after 16. If she's in a 16 now, it's worth knowing where 18 lives before you need it.
What comes after girls' size 16?
Size 18, often tagged XL to XXL or Plus, then 18 Plus and extended tween sizes to 22. After that it's women's XS or junior plus. The jump from 16 to 18 is where the sold-out problem starts, which is exactly what our size 18 guide solves.
Is a girls' 16 the same as a women's XS?
Close in chest but not in fit. A girls' 16 has a shorter torso and less bust shaping than a women's XS. For a tall, slim tween a women's XS can work, but for most kids still in the girls' range a 16 or 18 fits better. Go by measurements.
Next sizes up: girls size 18, size 20, and plus swimwear for tweens.