If you're looking for pants that will last a long time, Prison Blues will do the trick. I bought my first pair a few years ago, and bought two more a few months later. They use a double-knee construction, with two layers of denim over the knees, and include suspender buttons like all denim pants once did, but few do now. However, if you're looking for something that will fade and get soft after the first couple of washings, these don't do that. They do eventually soften some, but remain stiff through several wearings and washings, and are also slow to fade. They are work pants, not dress pants, but you won't have to replace them often. They come in different price ranges, but you can expect to pay more than $50 for them, and I haven't looked into the differences between the less expensive ones and the more expensive ones.
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