Personalized Big Sis Of Twins Sister Announcement T-Shirt. Girls cute big sis of twins T-Shirt - Navy Blue twin reveal announcement clothing for a big sister. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.