Work pants?

Hello all. ISO good quality work dress pants (black). I’ve been wearing White House Black Market for years but I just ordered two new pairs and the quality is TRASH. They went from being 59% cotton to 0% cotton. They are almost exclusively polyester now yet are still priced at $100+. I don’t mind spending money on clothes that last but will NOT spend that much money on cheap plastic pants. Where do I buy work pants from now??