Thanks Caroline- You've reassured me that I'm wise to be cautious!
I've given it some thought (which explains why I am posting at 5am...) and
Yes I've come across this type of woven design. The wrinkling in the 'background' can't be ironed out. The customer has lived with this fabric for years
Can you mount it on buckram or something similarly stiff to keep it stretched smooth?
Thank you - the existing one had stab stitches, which I was intending to do, but I've read here that it can let further light through, although I'm prepared