Personalized Number 1 Great Grandma T-Shirt. Great grandmother gift T-Shirt - Athletic Heather with distressed design that says number 1 Great Grandma. 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.