Personalized Keep Calm Mardi Gras T-Shirt. Mardi Gras T-Shirt - Light Blue with green, purple and yellow fleur de lis says KEEP CALM AND MARDI GRAS. Distressed finish. Perfect for Fat Tuesday parades and celebrations. 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.