My best clothes are those that last the longest. They are stiched securely and made of fabric that doesn't tear easily. In terms of pants, this means jeans. I've never, ever had a pair of dress pants that would stay in good condition as long as a pair of jeans, assuming equal duration of wear.
I don't know where you buy your clothes,but there are dress pants which wear well and do last as long,if not longer,than dungarees. And "best" is a word used to describe one's good/dressy clothes, not those that last the longest.