Personalized Trombone Text Shamrock Youth Long Sleeve T-Shirt. A shamrock made from the word trombone and small shamrocks is a unique gift design for low brass musicians and music students and teachers on St. Patrick's Day and at Celtic festivals. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)