It's a Building 
Art Notes: "I say, anyone for Cricket?"
Luckily, there were some images of the spacesuits in the novelisation. A curious blend of astronaut, Samurai and Cricketer.
See the cricket pads - above? I wonder of Ridley ever had it in mind to look up Francis Bacon's work when researching a visual style for the film.
Francis Bacon Study of The Human Body, 1982. Musée d’Art Moderne, Paris
I wouldn't like to bluntly class Bacon's work as horrific but his Studies for Figures at the Base of a Crucifixion certainly are.
Francis Bacon (Detail of) Three Studies for Figures at the Base of a Crucifixion c.1944 Tate Galley, London
You know, in that novel there was a puzzling and weird photo of Ripley in her space helmet - showing some of that interesting costume design - but which I could never quite figure out, as a kid. Before I read the actual text of the novel, I saw the photo and immediately assumed that it was some horrific part of the story in which a victim's severed head was somehow being kept alive inside a special chamber. I couldn't see where her neck could be. The caption "And in space no one can hear you scream" ran underneath. A terrified, disembodied live head - silently screaming. Jesus!
There you go (above). Now, you tell me: where's the rest of Ripley's body?