Who's to say similar advancements in space travel can't happen?
Well, sure, they can, but the fact remains that business suits are only suitable for Earth wear. What happens if there's an emergency? Space travel requires space SUITS. Pilots on commercial airlines can get away with what they wear because, well, the planes don't go into outer space, you know? An astronaut must wear a spacesuit because that's what they need to do their work.
and when you're doing long duration space flight they are pretty much impractical.
Hell look at the Shuttle astronauts, one they are in orbit, the space suits come off and the jumpsuits go one.
A business suit is designed for looks. Not for practicality. Even if the astronauts weren't wearing pressurized suits, they wouldn't wear business suits either, because *their* sole function is to make the wearer LOOK good. An astronaut might wear what we would consider street clothes, but this would be limited to something like T-shirt and jeans, because those are for comfort and ease of work - NOT LOOKS. Astronauts don't need to look good.