Personalized Irish Flag Leprechaun Youth Long Sleeve T-Shirt. Funny novelty, lucky proud Irish St. Patrick's Day Youth Long Sleeve T-Shirt - Black with distressed leprechaun top hat, shamrock and Irish flag beard. For St. Paddy's Day or every day. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)