I bought 2 pairs of the same trousers from COS 2011/12
they are made from a heavy cotton fabric, with 5% "metallized fibers"
i have worn 1 pair of them about 300-350 times, 2 weeks ago the lining of a front pocket where i always put my keys in developed a hole. and today they had a crotch blowout, i'm gonna retire them and start wearing the second pair.
this was pretty much the first times i wore till it disintegrated.
3-4 years ago i tried raw denim, but i never found...