Personalized Believe In Leprechauns Youth Long Sleeve T-Shirt. St. Patrick's Day Youth Long Sleeve T-Shirt - White with a cute little leprechaun, dressed in a green suit and derby. He smiling because he found the pot of gold at the end of a colorful rainbow and says I BELIEVE IN LEPRECHAUNS. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)