Size 0. It has a relaxed fit for a size 0, so I think even those who usually wear a size M can wear it. I've been wearing it, so there's a slight feeling of use, but I think you can still wear it beautifully ^_^ It's a very cool and eye-catching polo shirt. Made of pique fabric, it's cool and will be useful for the coming season. Flat measurements: Width approx. 43cm Shoulder width approx. 33.5cm Length approx. 56.5cm Smiley face Camouflage Camo pattern Camouflage Briefing PEARLY GATES MASTER BUNNY EDITION Jack Bunny!! Tommy Hilfiger BEAMS GOLF MARK & LONA Munsingwear Le coq sportif Color: Gray Type: Polo shirt Length: Short sleeve