Personalized Trombone Player Future Toddler Full Zip Hooded Jacket. Future Trombone player Toddler Full Zip Hooded Jacket - Black with has when I grow up I'm gonna be a trombone player slogan and colorful kids handprints. 7.5 oz., 60/40 cotton/polyester. Jersey-lined double-needle hemmed hood. Pouch pockets for all their treasures. Coverstitched shoulders and armholes. Coverstitched rib waistband and cuffs.