A combination of the recent passing of Neil Armstrong and rewatching the first two episodes of season 6 of Doctor Who (which revolve around an impossible astronaut and the Apollo moon landing) led to this. I obviously have no idea what a space suit looks like.
Sketches From Memory 
Probably a lot like that.
Except for the underwear on the outside.
Astronauts are superheroes. And superheroes, current DC policy notwithstanding, wear their underwear on the outside.