Personalized Trombone White Text Shamrock Youth 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. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.