Jessica Simpson Crochet Flutter-sleeve Swimwear Cover Up Color: White - 92% Nylon 8% Spandex SM: Pit to pit 19 inches, width at waist band 13 inches, waist band does stretch pretty good, length 28 inches. (Pos-8) MED: Pit to pit 20 inches, width at waist band 14 inches, waist band does stretch pretty good, length 28 inches. (S908) LG: Pit to pit 22 inches, width at waist band 16 inches, waist band does stretch pretty good, length 31 inches. (S804) XL: Pit to pit 13 inches, width at waist band 17 inches, waist band does stretch pretty good, length 31 inches. (Pos-8)