The outer fabric is a thick 100% silk satin, and the lining is polyester. As you can see in photos 4 and 5, there are stains on the sides. There are similar stains on both sides. (For those who will remove the stains with a neutral detergent and baking soda or citric acid.) Originally intended for parties, but I think it would be nice if you could wear it as loungewear. The back is wide open, so I think someone of size M would be able to wear it better than someone slender. If you are well-endowed, even a slender person might be fine. Color...Silver Pattern...Solid Silhouette...Flare Season...Spring/Summer