Artmomma, she used cotton voile, which I'm finding harder than the dickens to find. I hope someone comes up with a source. The Stitchin' Post in Sister, OR had some, along with Valorie Wells flannel, but they are out of the voile. Any help out there in the USA?
I guess we could substitute Liberty of London cotton, but it's $32.00 a yard, and a bit more than a yard is needed for 40 square inches.