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BIRGER ET MIKKELSEN COAT
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The white Reiss dress she wears in her 2010 engagement portrait (along with her favorite Links of London earrings) is such a huge hit that the British brand reissues it. The Duchess seems to be a big fan too, rewearing the look on Canada Day in July with bold red accessories and a flirty fan clutch.
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BLUE BROCADE COAT
Another wedding standby, Kate dons this coat with a coordinating clutch, navy pumps and a sky-blue hat for a pal's "I dos" in London in 2009, and then refreshes it with nude pumps and a darker fascinator for Prince Philip's 90th birthday in Windsor, England, in June.
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TED BAKER LONDON TRENCH
Kate shows the versatility of a classic fitted trench, like this A-line navy number from Ted Baker London. Whether worn with tights, boots and a hat to a 2008 horse race or with coordinating pumps for a stylish summer tour of North America, it's always in style.
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Another of the Duchess's favorite high street stores is Zara, where she picked up this bold black-and-white print dress that is as appropriate for a 2007 night on the town as it is for a June 2011 wedding – with more formal accessories, of course.
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DIANE VON FURSTENBERG DRESS
Kate sports a kelly green Diane von Furstenberg dress and a printed clutch by the designer at an L.A. party in early July, and then wears the same dress with a sleek black clutch for a pre-wedding celebration for Zara Phillips later that month.
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Proving that a great blazer can be dressed up or down, Kate teams her navy Smythe blazer with a coordinating Roland Mouret sheath and Mulberry purse for her flight from London to Canada in June, wearing it again with a ruffled top and J Brand jeans a few days later in Alberta.