Personalized 1st Birthday Unicorn Adult Sweatshirt. A pink unicorn surrounded by a colorful rainbow, next to a sunny yellow 1. Cute gift for the birthday girl's first bday! Stay warm and stylish with this classic adult sweatshirt, perfect for everyday comfort. Crafted from soft, durable fabric, it features a relaxed fit for added coziness. Whether you’re lounging at home, running errands, or enjoying outdoor activities, this versatile sweatshirt is a wardrobe essential for any season.