Personalized Missing Piece T-Shirt. A large jigsaw puzzle piece with the text, one piece missing, is a unique puzzle gift design for jigsaw lovers and autism advocates on birthdays and holidays. 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.