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