>> What size mesh is the stuff crafters use to make rugs?
I don't know, but at least it would be available in wide widths.
I have gotten some 1/8" black nylon mesh fabric, but it;s holes are larger than 1/8" hardware cloth. Next time I'm in a fabric store I'll look for a finer mesh. I can always use 1/4" hardware cloth to support the flimsy fabric.