Yes. Maybe polar fleece encased in white flannel for extra warmth. I find fleece throws and such very cheap but not colors or prints that I would want on the windows. I have found nice ones (twin size) for 2.00 in the seasonal sale. Thank you, Shirley
Over time, I've picked up remnants of Polar fleece and made curtains for my windows and even put a piece of navy blue inside my back door. It is amazing how much cold air doesn't come in now. Also try Goodwill or like for blankets. I've hung my fleece curtains from extension rods after making a sleeve at the top for the rod. Easy to slip curtain off to wash and replace.
Yes, I cover my old windows with layers in the winter - plastic over the windows inside, then heavy hand-crocheted curtains, then long drapes. Next year I may make simple quilted drapes to keep the drafts out. It all helps, and I think white flannel will be a good insulator for your windows.
For looks white would probably look best but a darker color like black would attract and hold in more of the suns heat.
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