This is a denim-style, size M, button-down detachable collar. It's 100% cotton. You can layer it like a blouse for a layered look. Items marked with ☆ are 100 yen off for each additional item purchased. I also have other women's fashion items for sale! #marino's women's clothing - Color: Denim color - Size: M - Design: Button-down detachable collar - Material: Cotton Thank you for looking.