Personalized Best Teacher Fish Youth T-Shirt. Youth T-Shirt - White 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. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.