Joe B. WallI'm a huge fan of trousers made of "flex" canvas or denim, or "stretch," or whatever they want to market it as, because having dungarees that are supple and move well is a killer app in the clothing arena. That said, their aging and failure mode is amusing, because they tend to hit a point where they just start getting bigger and bigger, in the same way testicles and breasts get lower with age. Suddenly, comfy trousers turn all vaudeville.