The spacesuits used in “Alien” were practical and impressive ... and responsible for actors passing out on set.
Passing Out Became A Regular Occurrence On Set Of Alien
One of the more appealing details of Ridley Scott's 1979 sci-fi film "Alien" is that it looks weirdly down-to-earth. This is not the stuffy, formal world of "Star Trek." This is a future world of grunts, laborers, and normies. But, since it was still a space-bound sci-fi adventure film, space suits were still going to be necessary. Necessary, but not comfortable. As it turns out, a simple design flaw caused the already hot suits to nearly suffocate the wearer.