Are you looking for vintage lingerie??? If so, I don’t know any specific sellers, however, there are a few vintage lingerie teams on Etsy! Here’s a link to the team with the most members:
The members of the team sell mostly negligees, so check out their discussions/new listings and team members! This should help guide you in the right direction!
Throwback Rack sells lingerie from time to time. We’ve got a few nightgowns currently, but that’s about it! You can check them out here: https://www.etsy.com/shop/ThrowbackRack?section_id=11173730