It is almost impossible to imagine modern life without this device; yet for the first thirty years or so, from its patent in the late nineteenth century, it represented no real advantage over traditional fasteners like the hook-and-eye or the old-fashioned button. The zipper was mechanically awkward, liable to rust, liable to fail (i.e., snag or burst open), and so expensive that it doubled the retail price of a skirt or a pair of pants. But from...