Personalized Music Notes and Shamrocks T-Shirt. A jumble of shamrocks and music notes is a fun gift design for the Irish and the Irish at heart on St. Patrick's Day and at Celtic festivals. Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.