"If the Gestapo took away your Bloomingdale's charge card, you'd tell 'em everything."

...Or so says Woody Allen to fashion icon Diane Keaton in Annie Hall. Today my mother and I practically burned off the magnetic strip of her Bloomingdale's card, which is actually pretty unusual for her as she's the most frugal, unfashionable person I know. Considering my tom-boy Mom is sandwiched between my beautiful and stylish Grandmother and her label-obsessed daughter (yours truly!), it's clear that fashion sense skips a generation.

But what about fashion that transcends generations? Women today are wearing menswear the same way they did it in 1977, because of Diane Keaton. Do you know anyone who doesn't own a vest? I think it's fascinating that what was one woman's particular fashion eccentricity, decades later is a wardrobe staple.

We have Audrey Hepburn to thank for the LBD.

Irene Castle is credited with popularizing short hair in the 1920s, and she talks about the advantages and disadvantages about it in this hilarious essay.

Who are your favorite fashion icons? How would the world of fashion be worse off without them and their contributions?