The latter two features are important since I get around town by bike, and am at the mercy of the weather, plus annoyed when my pants touch my bike and acquire permanent black stains. That stuff washes right out of my synthetic pants.
Meanwhile, I perceive that cotton clothing has gotten worse, most notably wearing out sooner. I probably won't buy any more blue jeans, even name brand, though it's not unthinkable that the ones I've gotten recently are counterfeit.
Fortunately I live in a casual town, and my job is "engineering casual." ;-)
I'm not sure about the relative environmental impact of a pair of cotton jeans that lasts a year, or a pair of hiking pants that lasts six years.