Personalized St Patricks Grammie Leprechaun Irish Youth Long Sleeve T-Shirt. Grammie's little leprechaun Youth Long Sleeve T-Shirt - Royal Blue St Paddys Day outfit for kids. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)