Personalized Monkey 1st Birthday T-Shirt. Whether you're planning a big birthday party or just a small gathering with family and friends, our Monkey design outfit is the perfect choice for the occasion. The fun and playful design will add a touch of charm to the celebration, making it a memorable day for everyone. Your 1 year old will look absolutely precious in this outfit! 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.