Personalized Luckiest 1st Grade Teacher Youth T-Shirt. Funny St. Patrick's Day Youth T-Shirt - Heather for grade school teachers with lucky horseshoe, pot of gold, Irish shamrocks and chalkboard text says LUCKIEST 1ST GRADE TEACHER IN THE WORLD. 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.