Personalized Retro Rainbow World's Best Big Sister Toddler T-Shirt. Whether it’s for a birthday gift or just because, this stylish apparel is a great choice for any occasion. It’s designed for comfort and style, making it ideal for everyday wear or special family gatherings. Your big sister will feel extra special wearing this, reminding her of her important role in the family. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.