In 1977, when Annie Hall was released, no one went to a Woody Allen movie for fashion tips. Yet this New York romantic comedy produced one of the most distinctive looks of the decade. Diane Keaton's beat-up hats, baggy trousers and crazy layering encapsulated a fearless individualism and the character herself was impossible not to fall in love with. William Banks-Blaney explains how Diane Keaton made men's clothes redefine womenswear in the 1970s.

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