Personalized Chemist In Training Childs T-Shirt. Cute chemist in training T-Shirt - White has chemistry beaker design for a boy or girl wanting to be a chemistry teacher or a scientist when they grow up. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.