I've seen a few threads with people asking this same question, and I always wonder if it would be possible to take smooth leather half chaps to a good cobbler and have them put in an elastic panel in the back to add a couple of inches and some stretch. If I were in your position I would consider taking a picture of the half chaps that you want, take them to the cobbler, and see what they could do.
You would be surprised what those guys can do. I got my tall boots with zippers shortened, and they look as good as new for only $30. IMO, a good cobbler is basically a wizard.
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