These dresses have 100% cotton body and lining, so its breathable. The mesh overlay and trim is made up of 92% polyester 8% elastane. The sizing on these pieces run from sizes 3 13. However, I wish is that Disney would make these in larger sizes up to a girls 18 because many girls are getting left out with sizing. Cinderellas vivid storytelling comes to life in a durable, washable, comfortable...