Personalized Dinosaur Stegosaurus Cute Youth Long Sleeve T-Shirt. Stegosaurus Dinosaur Youth Long Sleeve T-Shirt - White has a big smile and lots of dino charm. Perfect for any dinosaur lover. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)