Costumes are made of medium weight (not see-through) spandex. Elastic waist falls just below the natural waist for comfort. Children's sizes are as follows: W (in.)/H (in.)/Size (U.S.) XS__21/21-22/2 - 3 S___22/23-24/4 - 5 M___23-24/25-28/6-7 L___25/29-30/8-10 XL__26-30/32-36/12-16 If you are looking for adult sizes, please look in the Adult Leggings section. If you don't see what you want, drop me a message. If you need larger quantities, let me know. Hand wash separately in cold water, mild detergent and line dry. No bleach, fabric softeners, iron or dry clean. The bright shiny foil finish may fade after wear and washing.