Personalized Best Teacher Fish Toddler Long Sleeve T-Shirt. Toddler Long Sleeve Tee - Black with cute and colorful school of fish says WORLD'S BEST TEACHER. Teacher fish is leading the way. Perfect teacher appreciation gift for your favorite educator. 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.