Personalized Irish St Patricks Day Letter M Monogram T-Shirt. Irish Letter M T-Shirt - White alphabet gifts. Sure an this stylish St Paddy's Day monogram is just right for wearin' on St Patrick's Day, if your name begins with M. 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.