Personalized Whale Little Sister Youth T-Shirt. Little sister Youth T-Shirt - Kelly Green with a cute pink spouting whale in the ocean. Colorful text says LITTLE SISTER. 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.