I'm kinda hooked into the Levi's skateboarding stuff. I have both 513 and 504 and they fit great (just go a size up on the 513 for a decent fit). They fell a little more sturdier, not so stretchy as the kr3w pants I used to have, but more durable aswell. I always try to buy them on sale but still a little expensive.
I also got the cargo pants from them but they arent that good to skate in. Kinda heavy and hot, so you sweat a lot, I just use them casually.
The other day I also bought some random ones on a "tradicional market" that I think they are working pants, just dark grey with no brand at all but they feel great. Dirt cheap (10?), cargo pockets, straight fit similar to dickies but reeeally comfy, fells sturdy aswell.