Interesting. I work in the cement industry. We mine all the raw materials and make that grey powdery stuff called cement (along with differnt tpyes of mortar) and you'll be hard pressed to find a pair of Levi's out here.
When you do they are being worn by
1.) One of the girls payroll or
2.) Somebody from the home office down in Phoenix.
For those who get down and dirty it's either Carhart's or, most commonly, Wrangler's.
I know from my experience that Levi's have held up better than Wrangler jeans. Carhartt are the absolute best though.