Thanks for all the do-it-yourself tips. You folks are much more resourceful than I am.
I am trying to avoid black as I photograph mainly in the southwest US and it's generally too hot to hide under a black cloth. I'm looking for a silver outside/black inside cloth. Yes, I know I can make one of those, too.
Let's just say I'm lazy and don't want to exert the effort to fabricate my own cloth. I'm really just trying to find out what size cloth to order pre-made. I'll just call a couple of the manufacturers.
John, thanks for saving my literary butt.