Personalized 100 Days Of School Is Cool Infant Dress. 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! Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!