Personalized Groomasaur Youth Long Sleeve T-Shirt. Groomasaur! A cute T-Rex with a top hat and bow tie is ready for his wedding day. Cute gift for any groom who loves dinosaurs. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)