Left to right: ‘Killraven’ from Marvel comics, 1973; 'Vampirella', from Warren Comics, late 60s; and bottom, a hapless Sean Connery in a still from the movie Zardoz, 1974.
My brothers and I referred to them as ‘pudsuits’, since they left uncovered most of the body save for one’s privates. They seem to have been an exclusively 70s phenomenon, since I haven’t observed many dedicated sci-fi characters in the popular culture sporting similar outfits over the past 20 – 25 years.
