Personalized Happy 100 Days Of School T-Shirt. Celebrate the milestone of the 100th day of school with our Happy 100 days of school design! This adorable outfit is perfect for kids who are looking for a special outfit to mark this special occasion. With its cute design, it will make your little one stand out and feel proud on their 100th day of school. It also makes a thoughtful gift for a female teacher to commemorate this milestone in their career. 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.