Its not Nylon, or Perlon. It's Batistalon!

Pretty late1970s full slip by Rösch of Tübingen, Germany in a rather uncommon fabric called Batistalon, a Perlon derivative, which was granted its patent in 1962 and ceased production for lingerie in the 1970s, the patent finally expiring in the mid 1980s. 

SEE THIS SLIP - CLICK HERE