Personalized Autism Spectrum Niece Awareness Support Walk Long Sleeve T-Shirt. I love my niece with Autism Long Sleeve T-Shirt - Vintage Black has a lovely multi color heart shaped puzzle ribbon for an Aunt to wear at an April support walk event. 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