Thank you for viewing! The waist is elastic. My hips have gotten bigger, so... I couldn't wear them much (T_T) They're denim, but they feel stretchy. I think the colors in photos 3 and 4 are the closest to the actual color. I don't think there are any noticeable stains, but I apologize if I missed anything m(_ _)m I ask for understanding regarding used items m(_ _)m