Personalized Irish Shamrock Letter Y Monogram Youth Long Sleeve T-Shirt. St Patrick's Day gift Youth Long Sleeve T-Shirt - Heather has shamrock monogram Letter Y design for St Paddy's Day parades and parties with green clover background and black alphabet Y. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)