Then a small IVA suit...or..
Something like Sokol, which takes very little room.
But how about conceiving the CEV in such a way that a pressure suit would be useless?
I mean, a leak would be lethal no matter what the astronauts wore.
I've always been surprised that even though Shirra disobeyed rules by not wearing the spacesuit during the Apollo 7 landing, every later Apollo flight did likewise, even after the Soyuz 11 tragedy.
The pressure suit came back, after Challenger, and it couldn't save the Columbia crew.