Can anyone identify this fabric?

I have got some fabric but I have no idea what it is called! I know it is made of silk but it is very open weave and I would like to try and find some more but don’t know what to search for. I have photographed it next to some white organza to show just how open weave it is. If anyone can help I would be eternally grateful!

It could be a muslin or scrim or gauze, all of these are open-weave fabrics. They’re usually cotton, but can be silk as well.