Officially Licensed Dr. Seuss boys kids pajamas. The Cat In The Hat is the main character in a series of books written by Dr. Seuss, The various stories are written for children. The Cat can show up with his companions Thing One and Thing Two turn any normal situation into chaos. However, the Cat always seems to get things fixed just before the adults show up. The pajamas top as long sleeves with striped arms that match the striped pajama bottoms. These are meant to fit tight and snug-fitting. Never too early to teach children the joy of reading and the imagination opportunities that can come with great characters from the Cat In The Hat.