 Well, the show's creator, the late Sherwood Schwartz, explained in the past that it's meant to show how the rich always manage to have the best of everything, no matter the circumstances. So it's not grounded in logic, but it's still an interesting choice, metaphorically speaking. Also, the Howells were originally supposed to be the only characters with a change of clothes, but Ginger and Marianne had a variety of outfits, too. Mm-hmm.