The material on this gorgeous dress is 65% cotton, 35% polyester. Measurements are as follows! Bust: Small-34", Medium-36", Large-38". Length: Small-33.5", Medium-34.5", Large-35.5". I've modeled these dresses to see how they fit and there's a ton of stretch. I'm a 40" bust and the small dress still fits me perfectly. Feel free to comment below with any questions!