Personalized Sister of the Groom blue wedding Youth T-Shirt. Sister of the Groom blue Wedding Butterfly Youth T-Shirt - White gift for your bridal party. Lovely blue butterfly marriage logo. 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.