Personalized Trombone Music Marching Band Infant Romper. This fun trombone design makes a great gift for the aspiring trombone player or trombonist. Meet your new favorite outfit! Keep dressing simple with this one piece, lap shoulder t-romper. Super soft and perfect for baby's sensitive skin. 5.5 oz. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40; Heather is 90/10 combed ringspun cotton/polyester)