The fabric is 100% cotton, not too thick and not too thin, so it can be worn for three seasons. Please note that it is not as thick as a flannel shirt. Size M Measurements (laid flat) Shoulder width: 48.5 cm Sleeve length: 62 cm Width: 56.5 cm Length: 84 cm Please allow for some error. For reference, I am 174cm tall and weigh 64kg, and I wear this over a t-shirt. It has a moderate amount of room, but it's not oversized. Please purchase if you understand that this is a used item.