ways to isolate silver thread?

Whandall:
I think stainless material will be too rigid, but check it out.

No it's not, it is like a thick cotton, you can sew with it and is very flexible. The only snag is that it feels a bit rough to the touch as it has whiskers, which can short adjacent threads if they are too close. Don't go closer that 1/8". These whiskers are invisible to the naked eye but you can see them under a microscope.