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Princess Goals Literally resembling Cinderella, Princess Diana had a fairy tale moment in a periwinkle blue Catherine Walker chiffon gown and matching stole, which completely enhances the ensemble, at the 1987 Cannes Film Festival

Open back, cross-back strappy design

Its a voyage-of-discovery story where virtually every element has to be discovered from scratch, and its simultaneously kooky and solemn, haunting and extremely silly

But with all great dresses, the best ones don't tend to stick around for long here, so be quick

So, pleated pants are very functional

But the beautifully draped nude-and-black Lanvin number she wore to the 2009 Oscars deserves to be celebrated for its interesting blend of avant-garde allure