Well, I don't know if this is helpful or not, but this is what I did.
I found some canvas like material that I thought would work for curtains at my local Walmart. Where else? I cut it out a little larger than the window, and fold over the side and sewed them up for finished edge. I then apply the script of 1 inch wide magnetic tape all the way across the top. Got that at Walmart too. Super glued the ends because Tate doesn't stick to fabric very well. Now I can just stick them up on the frame above the window when I want privacy.
For storage, I roll them around a piece of 3 inch PVC pipe, rubber band them, and strap them up to the side wall along with the lawn chairs and beach tent