I'm making a maxi dress from a lightweight rayon knit, and I'm having a hell of a time trying to get it to lay flat on grain to cut it. Any suggestions? I'm laying it out on my bed, so it's not slipping around, but I can't get it on grain. I'm pretty much treating it like silk, I'm just not having great success.

I'm not having a good sewing day. I thought my machine was messed up this morning (it was skipping stitches and breaking thread, argh!) and was fiddling with it until I realized that I had the needle inserted wrong. :facepalm: