A bit of old cotton from a well-used t-shirt should be good protection. Maybe cut off the neck and sleeves, and just slip it on over the body of the guitar before casing. The "fur" inside the case should not be very abrasive -- assuming it is clean. That wear pattern looks like a pressure area from the case padding. Are you sure that you have French polish? That can be renewed nicely by rubbing in some fresh shellac, the same as the original finish process.
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