I've just been out trying out blankets. I put down a space blanket ground cloth on the grass. Walmart blue sleeping pad. Bundled up with wool sox, long pants, t-shirt, down vest, fleece long sleeve shirt.
After trying several combinations, I was comfortable enough with combined army wool blanket and an all weather space blanket. Too much to carry.
I think a quilt is the way to go. Silk long-johns, too.