I have kept this at home with almost no use. I believe it's equivalent to a women's L size, but I'm not sure. It has a lining and is warm. The hem also has a drawstring. I don't think there's any feeling of use or stains, but the elastic in the waist might be loose. (It might have been like that originally.) There's a waist string, so you don't have to worry. I measured the size flat. The waist size is approximately 40cm when laid flat. Thank you for your consideration.