Personalized Luckiest Kindergarten Teacher T-Shirt. Funny St. Patrick's Day T-Shirt - Vintage Black for kindergarten teachers with lucky horseshoe, pot of gold, Irish shamrocks and chalkboard text says LUCKIEST KINDERGARTEN TEACHER IN THE WORLD. Everyone loves our Custom T-Shirts! 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.