Personalized Shamrock Irish Flag Youth T-Shirt. This colorful Irish flag logo with green shamrock clover is a lovely gift for any Irish friend for St. Patrick's Day. It comes on a holiday Youth T-Shirt - White. 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.