I think I've got mine from Rosa or something like that. They were luckly on offer and they were too long. What I did was fold in to two and hand stitched and hang like that. It is thicker now and when I close the curtains it does not let the sun into our rooms. Hope it helps.

I used to cover the windows with black bin bags. Everyday I had to take it off and put it back it was difficult and tiring as the tape would not stick to the walls