This is a size S, but it was purchased by someone who usually wears a size M. It's an American size. Shoulder width 35cm, body width 43cm, length 54cm. A J.CREW polo shirt with a blue and white striped design, made of 96% cotton for a comfortable feel. - Brand: J.CREW - Size: S - Material: 96% cotton, 4% spandex - Design: Striped pattern, polo shirt, short sleeves - Color: Blue and white stripes Thank you for looking.