This is an Adidas golf shirt. There are no noticeable stains. The size is indicated in overseas sizing. OT: This is a Japanese women's size notation. Generally, it is a tall (long length) version of size "O" (equivalent to men's size L), or often equivalent to women's size XL. XG: Refers to "Extra Large" in international size (for overseas). Please use this as a reference. Personally, it feels like a size M.