I can see countless crotch holes. O:
Jeans are my favourite.. but I have a pair of riding tights with knee patches. They were like $25. Not flattering, but functional. I need nice jods with knee patches for shows.. between a slick saddleseat saddle and a slick set of pants, it's a wonder how I managed to stay on!
Riding tights are a little thicker than normal tights. I think mine are polyester, but they make bamboo, which breathes well.