Personalized Cordelia and Birds Believe in Yourself Long Sleeve T-Shirt. If you believe in yourself, you can achieve whatever you set your mind to. Cordelia and Birds Believe in Yourself Long Sleeve T-Shirt - Athletic Heather, from the children's book "Cordelia" by Michelle Nelson-Schmidt. 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