Personalized 3rd Birthday Princess I'm Three T-Shirt. 3rd Birthday gift for your little girl who will look so sweet wearing a cute The Princess Is Three crown T-Shirt - White gift that is perfect for her special third birthday celebration party. 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.