Labor-saving devices don't.

Back when you had to wash clothes by hand, people wore the same outfit all week (except Sunday, when they wore their "Sunday Best" -- and those might not get washed for months).

Men's dress shirts had detachable collars so you could wash the collar when it got dirty without having to wash the whole shirt. Women's dresses had removable ruffles at the bottom for the same reason.

Now that we have washing machines and dryers in every home, people wear something once and then have to wash it. And we take showers daily, whereas our ancestors who washed clothes far less frequently also bathed far less frequently.

Alex