Personalized I'm Going to be a the Big Sister T-Shirt. Check out our adorable Big Sister Elephant design apparel and gifts! Perfect for the older sister, this collection features cute pink elephant designs and phrases like "big sis" and "sister to be." Whether you're looking for a baby shower gift, a present for a new sibling, or just want to celebrate being the big sister, we've got you covered. 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.