I made my darkcloth. It's sized so the short dimension is will go around the rear standard of the camera. The long dimension is about 1 meter or so. Then it uses a weird Velcro-type tape, that has both parts of the Velcro mixed together-- the hooks are sort of buried under the fluffy loops so it doesn't snag on things. The downside is that it also doesn't grip itself as well as I'd like, but it works. I ran the Velcro about 1/2 meter along edges so the cloth closes into a tube.
I made the cloth from a heavy denim-like fabric, two layers of black and a third layer of white on the outside.
It's not really light weight, but it sure is dark inside.
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