Nope, this swim skirt will not make us instantly appear to be 3 sizes smaller or boost our behinds (whatever that means.) It is, instead, a skirt that we rely on day in and day out. It fits well, works well in water or on dry land, and looks good for days on end. By Title Nine. XS(2), S(4-6), M(8-10), L(12-14), XL(16).