This is a Wear Moi camisole leotard. The top half is made of a different material, it has two straps, and there are rhinestones on the back strap area, making it a design that is simple at first glance but has a twist. The size is listed as 16 years M. I think it's slightly smaller than a women's M. I think the size is somewhere between S and M. It has some signs of wear, but it can still be used.