Yeah, both contact paper and fabric occurred to me. Fabric is a bit dicey for me -- as crazy as this undoubtedly sounds, I've had a **** of a time finding sheets I can tolerate, and since some of these shades will be right by my head while I'm sleeping, it could be equally difficult to find fabric for the shades I could tolerate. Plus, there'd be no way to wash them if the fabric later became contaminated. Since the van is above all a safe space for me, I think it's not worth the risk.
And I'm worried that contact paper might not stick either, particularly over time. I suppose I could do something like wrap it around the edge, covering the outside by just a half-inch or so, and then adding staples.
I heard one other report about Reflectix shades shrinking over time -- that's really interesting. What are the commercial ones you bought, RD?