Personalized Worlds Best Cookie Baker Mom Long Sleeve T-Shirt. Cookie Baker Long Sleeve T-Shirt - White for children has colorful My Mommy is the World's Best Cookie Baker logo. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL