you kind of have to try and see what works best for you. i use cotton Voile/Veil/Vail (it has different spellings in different countries). you want something so thin you can see through it, it will have a little bit of "stretch" to it as well.
in the US, a good source is <<<<<Deleted advertising to a commercial site.>>>>>>>
no, i'm not affiliated with them, but i've found them to have good quallity and great service.