Back in late '83 (about 6 months before the film came out) my wife and I were out shopping in a central Ohio mall when I saw two people dressing in robes.
"Look! Those are stillsuits
!" I told her.
Sure enough, the movie company had a marketing campaign going before the release of the film.
Very innovative for the time.
(And considering the area, I was probably the only person in the mall who had any idea what it was about...)