Jeff Jones was kind enough to point out that his wife, I believe, found sheepskin covers for seatbelts at Brookstone, and I found them, too, thanks to his help. They come in a couple of colors, so I ordered two pairs...and they work great!
I had to sew a single pass of nylon thread through them, attaching them to the seatbelts, so that they won't slide down, or up. No big deal.
Thanks to Jeff for the suggestion...
Randy