Personalized Coolest Trombone Player Toddler T-Shirt. A snowman trombone player wearing a music note scarf with the text The world's coolest trombone player is a humorous music design for Christmas and the winter holidays. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.