Personalized Irish St Patricks Day Letter M Monogram Long Sleeve T-Shirt. Irish Letter M Long Sleeve T-Shirt - Kelly Green 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. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL