The size is L, but I think it's equivalent to a children's L size (for upper elementary school students to junior high school students). The waist is elastic, and the fabric is generally stretchy, so I think it's comfortable to wear. I'm selling it because my child has outgrown it. ⁠◕⁠‿⁠◕⁠。 There are no stains, but the tag has deteriorated. Please be aware of this. When worn, it was used with a supporter. This is a used item, so please understand before purchasing.