My daughter is very slim but due to her height she wears a size 5-6. I bought her a size 4-6 pink leotard for ballet practice and it is too small (tighter than a leotard and cuts into her butt and shoulders). It's also transparent, but I like the material it's made of. It's stretchy (much like a bathing suit) and I don't have to worry about it rubbing like cotton. I gave 4 stars because I think once I get the larger size it will be the perfect swimsuit for her (once I find some nude lingerie for her).
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