Has anyone experimented with using tough work trousers for rock climbing? I currently use the cheapest pair of polyester tracky bottoms I can find so that when I tear them on some rock they can be cheaply replaced. I've never bought proper climbing trousers because they seem to be either too baggy to be sensible for trad, or otherwise, too flimsy for the task of udging up chimney,etc (given the price).
So I considered something like this:
http://www.screwfix.com/p/hyena-snowdon-work-trousers-brown-grey-30-w-32-34...
Or maybe an even cheaper version for £12.The main point being that they are meant to be really tough, reinforced knees, etc and good value for what you get. I guess they just might not be flexible enough.
Any thoughts? Anybody own any for work that definitely wouldn't recommend them for climbing?