Personalized 100 Days Of School Is Cool T-Shirt. This outfit can be a fantastic costume option for women on the 100th day of school. Whether you're a mom or a teacher, our unicorn 100 Days of School design is sure to make you stand out. Complete with a matching outfit for girls, everyone can join in on the celebration. Don't miss out on the opportunity to commemorate this special day in style! 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.