Personalized Big Sis To Be Girls Sister Announcement T-Shirt. Announce you're a Big Sis To Be T-Shirt - White with this stylish design with pink hearts and butterfly. 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.