I know I'm late to the game but for future readers, another consideration is that the fabric should be 100% Polyester, if possible. Or anything made from plastic. Cotton and cotton blends will stain and require more work and bleach. Any synthetic material will just wash out easier. I have had shows with dirt, mud, blood, food, food coloring, anything that was synthetic was MUCH easier and required less work. Heck, polyester wont even take dye! Just to be safe - double check with a swatch from costumes and do a patch test.