It's a size 150, which is a Japanese size S. It's a short length and a tight fit, so it's recommended for those who like Korean styles! It also makes your arms look slimmer and your legs look longer. I've only worn it once. Navy blue Polo Ralph Lauren V-neck sweater with red polo embroidery. - Brand: Polo Ralph Lauren - Color: Navy - Size: M (10-12) - Features: Red polo embroidery Thank you for looking.