Hi Chaps, i just checked on internet and there lots of companies that sell fibre glass sheets, to 3m x 2.420m in various colours UK based. Thickness varies as does patterns, plain seems the one you may wish to purchase. You should be able to flex it quite a bit, even the 6mm sheets, and ideal for fitting semi flex solar panels on.
Or you can do what i did and buy a child's garden sun screen with flex poles, about £11.oo and works well even sailing in light breeze. Can be erected in 5mins .
good luck
Ray
merry xmas.