those are ...weird... people. obviously an attempt to look ridiculous. it would change the whole theme of the movie. they had a batman movie with a fatter batman in the 60s, and it worked on a different, campy level.
similarly, i think a prime design in the simplistic, bright red and blue, and unexplanable tire disappearance in a realistic movie would be equally as unpossible!
the 5 most recent bat films each had variant suits in various levels of realism (damn you, schumacher!)
the more off-the-wall the movie was reflected upon the costume design