Personalized I'm Going to be a the Big Sister Long Sleeve T-Shirt. Whether you're looking for a special present for a new sister, or a fun way to announce a new addition to the family, our Big Sister Elephant collection has something for everyone. The sweet elephant designs are sure to bring a smile to any big sister's face, and our range of products means you can find the perfect gift for any occasion. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL