The size is listed as M, but since I'm not sure of the Japanese size, I've compared it to the size of my child's clothes. I think it would fit children around sizes 120, 130, and 140. It hasn't been worn much, but there are some loose threads, so please check the photos. To prevent further damage, I will ship it without cutting the loose threads. This is a limited edition item from Disney Cruise Line, the cruise operator of Walt Disney Company. These high-quality products, with their attention to fabric and sewing, are popular with Disney fans around the world. This is a short-sleeved shirt with a colorful resort-style design. - Design: Colorful resort-style scenery and character print - Color: Blue - Material: Cotton or a cotton/polyester blend - Features: Short-sleeved shirt with buttons Thank you for looking.