Heh...
I usually ride in cotton stretch pants, like stirrup pants. English stirrup leathers start at the top and can pinch like the dickens, that's why people wear those tall hunt boots. I'd be most worried about that, if not getting scratched on brush.
I don't ride in shorts because I don't want to get all scratched up but I wear them a lot. The longer ones. I do wear sweats to ride though. They are hotter but I get on and off easier.