I've stopped by the Goodwill mid session between spots a few times and go through tons of $5 pants. I've ripped so many through the knee and blown out the seat. Oddly, I really liked black Old Navy Loose Ultimate Built-In Flex Chinos. Dickies are decent and everyone knows that. Most other pants get a hole in the knee after a mission (not session) or two.
I'm also advocating for the RVCA weekend pant. Really liked them but lost them traveling.
The other night, I hit a wet spot while taking a turn around a hill and rolled around in the Nike SB Flex pant in olive and surprised I didn't put a scratch on them. I went to the Nike outlet and found some clearance SB pants, hoping they'll hold up as well.
Polar Surf pants are great. I have the ones with the blue illustration over them. Feel great and look neato.
All of these are loose enough to wear long underwear under them too for winter skating. It might stick out the bottom but I don't really care.