Personalized Trombone Shamrocks Arc Toddler Long Sleeve T-Shirt. Trombone Shamrocks Arc Toddler Long Sleeve Tee - White are a neat way to show your pride in your brass! 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.