The waist is elastic. There is no size listed, so it is set as free size. Although it has never been worn since purchased from a United Arrows store, it has been stored at home in a closet for about 2 years, so please refrain from purchasing if you are looking for a brand new item. I lightly hand-washed it just to be sure before taking the photos for the listing. It looks a bit wrinkled because I haven't ironed it. If you prefer a more polished look, please iron it. It will be folded and sent via Yu-packet Post Mini size. Skirt: beauty&youth United Arrows