Personalized That Was Pretty Cool 100 Days Of School Toddler Dress. Whether it's a special event at school or a casual day out, our "That Was Pretty Cool 100 Days Of School" design is a must-have for your little one. It's a great way to commemorate this important milestone and create lasting memories. Get yours today and let your child shine on their 100th day of school! Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!