Personalized Mardi Gras 1st Birthday T-Shirt. Mardi Gras IT'S MY 1ST BIRTHDAY Mardi Gras T-Shirt - Gold with big number 1, purple Mardi Gras beads and purple and gold jester hat. Graphics by JW Illustrations. Everyone loves our Custom T-Shirts! 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.