Purchased from a Valentino store in Tokyo about three years ago. Authentic. Size is S. There is some yellowing around the neckline, but it's not very noticeable when worn. It has been hanging in the closet for a long time, so it's wrinkled, but I will iron it before shipping. I received it as a gift, so I don't have the receipt. Due to a time lag in receiving the item, I haven't had it authenticated, but I can change it to include authentication, so please let me know. #VALENTINO #tshirt