This is authentic as I purchased it at an Aeropostale store while living in the United States. It can be worn by both men and women. ☆ Red and white checkered long-sleeved shirt, American size M, which is about a Japanese size L. - Brand: AÉROPOSTALE - Size: M - Design: Checkered - Color: Red / White / Blue *This product is also being sold on another site, so please understand that it may sell out. Thank you for looking. #aeropostale #aero #aeropostale #fashion #shirt #mensshirt #casual #americancasual