It's a cotton knit. It has a built-in bra. It's beautiful, but there is some fading and pilling from washing. It's one size fits all and stretches, but the wearer is a size M. Marked size: One size Actual size (cm): Length: 48 Width: Approximately 27-45 Sleeve length: 46 (measured from the collar) - 3/4 sleeves ■Since the items are basically used, please refrain from purchasing if you are concerned about minor details. Please feel free to ask any questions you may have.