Personalized Worlds Best Trombone Player Long Sleeve T-Shirt. Cool trombone player gift has Worlds Best trombone saying in two tone sports style design and comes on this fun trombone Long Sleeve T-Shirt - White gift for your trombonist in marching band or jazz groups. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL