SkinnyShirt Women's Classic Long Sleeve Shirt As seen on ABCs SHARK TANK, the body of the Skinnyshirt is made from a stretchy knit fabric (90% nylon, 10% spandex) so that you can look smoother and slimmer than if you were wearing a traditional button down shirt. The fit of the Skinnyshirt is snug, so it is recommended to order a larger size if you suspect that you are between sizes. Get the smooth, fitted look of a button down shirt without the bunchiness and bulk. The poplin upper and collar are made from of a crisp, woven fabric (97% cotton, 3% spandex). The collar features four working and functional buttons  so that you can style your shirt just like you like it.