I bought some stuff long ago @ JoAnns (I think) that is silver, thin and has insulating properties.Yu could use that as your batting. I am sure they still carry it or something like it. I was going to make a window quilt, like a lovely scenic thing. I had planned on attaching to window frame with velcro so I could put up @ night and take down at will. Don't know how much use your door gets for the velcro but it certainly could be made as a curtain... hope this helps! BTW - I never did make the dern thing...... :)