Missing tag but it feels like cotton to me. Hand wash or dry clean only. I am a size 8 and it’s a touch big for me so might be a 10? Zipper is a bit stubborn sometimes but I’ve gotten it to go down all the way and it goes down enough for my to get it on just fine even when it’s being stubborn. Waist 15.5” From a smoke free, Fragrance free home.