SkinnyShirt Women's Long Sleeve Collar + Tails White 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 long sleeve button down shirt without the bunchiness and bulk. The tail length flatters your figure by being longer in back than in front. The collar features four working and functional buttons, and the tail has another  so that you can style your shirt just like you like.