Personalized Sock Monkey 1st St. Pats T-Shirt. T-Shirt - White with an adorable smiling green sock monkey in stripes and polka dots holding a shamrock. He says I'M SO CUTE IT MUST BE MY 1ST ST. PATRICK'S DAY. 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.