The Patagonia jeans you mentioned are "Made of . . . 33% T400® polyester comfort-stretch "

so I think they'll likely look good for a while but def not BIFL. I bought a pair of similar jeans with specs like that and they started wearing out after a year. I was looking at Raw Denim, that shrink to fit stuff. get it hemmed and tapered and viola, just the right amount of business casual