Squaring Knit Fabric?
I'm restoring an old house and just removed bookcases that were blocking three double casement windows. The light and ventilation are great, but now I feel like I'm in Macy's window, especially at night. So, to have a little privacy, I got a traverse rod and picked up some fabric to make draperies. The fabric I got is a fine polyester knit. The person who cut it appears to have done a good job cutting it straight, however, since it will be draperies, I'd like to be sure it's cut perfectly square. I know how to find the lengthwise "grain" (if you call it that in a knit fabric) but have no idea how to square the end to measure the panels.
Do you know a technique for cutting knit fabric to be sure the end is square?