Personalized Saint Patrick's Day, Luck, Believing You're Lucky Youth T-Shirt. Cute, fun and adorable design with clovers and text 'Luck is believing you're lucky'. Modern and trendy gift, perfect for Saint Patrick's Day. 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.