Fashion

There are no functional reasons why clothes should regularly change shape.
Following the tenet that form follows function dresses used to be quite large and comfortable.
Fashion is something that can become unfashionable.
An ephemeral attraction for a particular style at a specific time for a number of people.
An attraction deliberately created by commercial enterprise.
We are all prisoners of style and period.

The stupidity is not in the clothes or in the fashion, but in the people who blindly follow it.