This is a two-piece set. The back has buttons. There are no noticeable stains. The size is 70-80. Please understand that this is a used item worn by a child, and we ask for your purchase only if you are not concerned about minor details. Please check the photos carefully. - We will fold it compactly for shipping. - There may be creases from storage. Please understand. Please refrain from purchasing if you are sensitive to these issues. Also, we are not responsible for any issues after shipping, so if you need tracking, please comment before purchasing. Immediate purchase without comment is acceptable.