Personalized Preschool Dinosaur Back to School Youth Long Sleeve T-Shirt. Adorable dinosaur I love preschool Youth Long Sleeve T-Shirt - Black for back to school or as a 1st day of pre-K gift for students youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)