It's just a k1, p1 ribbing but alternate the colors. The yarn is variegated so it looks more complicated than it really is. I used a white Caron One Pound yarn and a smaller Caron worsted weight called Jetstream. They have a special 10 oz line that's supposed to match every no dye lot Caron One Pound color. I also knit and sewed a small pocket for the inside of the hat to keep my bus pass dry when it rains or snows. If the passes get wet, they get stuck in the machine. The pocket keeps it dry but handy so you're not hunting for it when the bus arrives.
Welsh corgis are cool.