It's a free size, but I think it's about a size M! I bought this, but I don't have anything to match it with, so it's probably going to stay in my closet forever, so I'm putting it up for sale! ^^♪︎ Geometric pattern oversized short-sleeved shirt. - Design: Geometric pattern print - Colors: White, Blue, Red, Black - Style: Oversized - Sleeve Length: Short sleeve - Buttons: Front button - Back Design: Geometric pattern print Thank you for looking.