Helen,
This was discussed a while back, maybe a month or two, you might need to search the Archives??
Several stated they used some inexpensive fabric and tacked to the inside of the door. I had suggested using the drapes (that I do not have installed). I think anything would work, my preference would be something "quiet", so it does not draw your eye in.
You could install with those really small cafe rods, or small short tacks, or maybe even velcro.
I believe three were a lot of MOC's with the DT's the last 24 hours or so!
Carol