Personalized Trombone Santa Hat Robot Infant Romper. A robot wearing a Santa cap and holding a trombone is a funny gift design for low brass musicians, music teachers and school students in concert and marching band at Christmas time. 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)