It sounds like it's the same stuff most people use for pettiskirts. You can find it online here:
http://www.afc-express.com/nylon-chiffon.htmlIt's called nylon chiffon and people like it because it's super-soft, doesn't fray and is relatively cheap. I've also found it named just Tri-cot. Always make sure it's
nylon and NOT polyester or some other fabric.