Personalized Big Bro Big Brother T-Shirt. Big Bro Big Brother offers a wide range of apparel and gifts featuring trendy and modern typography fonts, perfect for matching sibling shirts and baby announcement family photos. Our collection includes big sister little sister and big brother tees for kids, as well as promoted to big brother designs. 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.