Personalized Promoted to Big Sister T-Shirt. The "Promoted to Big Sister" apparel is available in various sizes to accommodate children of all ages, making it a versatile addition to any wardrobe. Celebrate the bond of siblings and the joy of family with this adorable collection, designed to make every big sister feel loved and cherished. 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.