Personalized Trombone Santa Hat Robot Toddler Long Sleeve T-Shirt. 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. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.