I happen to have an unusually large head to begin with, so that only the largest knitted kippot that I spend time stretching out even more barely fit. But now that I'm growing out my hair to donate for children with cancer, I have yet to find a kippah that fits. And since my hair is long, the smaller kippot that are secured with bobby pins tend to flop around all over the place.
Are there any other type of Kippot one could wear that work well with long hair? Perhaps a turban? I've been wearing a specialty extra large hat but it's my only one and doesn't look particularly religious.