Personalized Little Sister Comic Book Youth T-Shirt. Little Sister! Pow! Cool! A little sister is like a superhero, not just a sidekick. Cute Youth T-Shirt - White for any little sis! 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.