Erdem Dress(01 of27)
Open Image ModalLOOK 1: At the Trooping of Colours event in June 2012.LOOK 2: At a friend's wedding in September 2012.(Getty/Ikon Pictures)
Whistles Dress (02 of27)
Open Image ModalLOOK 1: At the Diamond Jubilee Concert, June 4, 2012 LOOK 2: At the London 2012 Olympics Closing Ceremony, August 12, 2012 (Getty photos)
Roksanda Ilincic Frock (03 of27)
Open Image ModalLOOK 1: North American Royal Tour in Beverly Hills, July 8, 2011 LOOK 2: Arts reception during the 2012 London Olympics, July 30, 2012
Jane Troughton Brocade Coat(04 of27)
Open Image ModalLOOK 1: At a wedding in London on August 14, 2009.
LOOK 2: At a celebration for Prince Philip's 90th birthday on June 12, 2011, wearing a Zara dress and L. K. Bennett shoes. (Getty photos)
Ted Baker Trenchcoat(05 of27)
Open Image ModalLOOK 1: At the Cheltenham Horse Racing Festival in England on March 14, 2008, wearing a black fedora, scarf and boots.
LOOK 2: Arriving at a hotel in Yellowknife on July 4, 2011, wearing navy pumps. (Getty photos)
Issa Dress(06 of27)
Open Image ModalLOOK 1: Arriving at the Goring Hotel on April 28, 2011, wearing L.K. Bennett wedges.
LOOK 2: Speaking with volunteers in Ottawa on June 30, 2011, wearing Pied à Terre slingback wedges. (Getty photos)
Gold Sign Jeans, White Ten Gallon Hat(07 of27)
Open Image ModalLOOK 1: At a rodeo demonstration in Calgary, Canada on July 7, 2011, wearing a blouse by Temperley.
LOOK 2: Watching a rodeo demonstration at the BMO Center in Calgary, Canada on July 8, 2011 in an Alice by Temperley blouse.(Getty photos)
Jane Troughton Gold Brocade Coat(08 of27)
Open Image ModalLOOK 1: Worn with a feathered fascinator to the nuptials of Laura Parker Bowles and Harry Lopes.
LOOK 2: Paired with an elaborate hat at Zara Phillips' wedding. (Getty photos)
L.K. Bennett Nude Pumps(09 of27)
Open Image ModalLOOK 1: Arriving in Ottawa, Canada in an Erdem dress on June 30, 2011.
LOOK 2: Arriving at the Calgary airport in a Jenny Packham dress on July 7, 2011. (Getty photos)
DVF "Maja" Dress(10 of27)
Open Image ModalLOOK 1: At the British Consul-General's residence in L.A. on July 8, 2011.
LOOK 2: At Zara Phillips' pre-wedding party. (Getty photos)
Reiss Dress(11 of27)
Open Image ModalLOOK 1: Keeping it simple while posing for official engagement photos.(AP photo) LOOK 2: Arriving at the Canadian Museum of Civilization for a Canada Day celebration in Quebec on July 1, 2011, wearing a Sylvia Fletcher/Lock and Co. hat. (Getty photo)
Sebago Shoes(12 of27)
Open Image ModalLOOK 1: Attending a dragon boat race in Charlottetown, Canada on July 4, 2011, wearing J Brand twill pants.LOOK 2: Boarding a sea plane in Yellowknife Canada, wearing J Brand pants on July 5, 2011. (Getty photos)
Pied à Terre Slingback Wedges(13 of27)
Open Image ModalLOOK 1: Speaking with volunteers in Ottawa on June 30, 2011, wearing an Issa dress.
LOOK 2: Boarding a plane in Yellowknife, Canada on July 6, 2011, wearing a Smythe blazer and J Brand twill pants. (Getty photos)
Smythe Blazer(14 of27)
Open Image ModalLOOK 1: Departing for Canada on June 30, 2011 in a Roland Mouret dress, carrying a Mulberry bag.
LOOK 2: Boarding a plane in Yellowknife, Canada on July 6, 2011, wearing twill J Brand pants and Pied à Terre wedges. (Getty photos)
Katherine Hooker Coat(15 of27)
Open Image ModalLOOK 1: At the Cheltenham Races on March 17, 2006, keeping warm with a fur hat.
LOOK 2: Launching a lifeboat in Wales on February 24, 2011. Catherine got the coat shortened (a look we much prefer!). (Getty photos)
J Brand Twill Pants(16 of27)
Open Image ModalLOOK 1: Boarding a sea plane in Yellowknife, Canada, wearing Sebago boat shoes.
LOOK 2: Boarding a plane in Yellowknife, Canada on July 6, 2011, wearing a Smythe blazer and Pied à Terre wedges. (Getty photos)
L.K. Bennett Black Wedges(17 of27)
Open Image ModalLOOK 1: Arriving at the Goring Hotel the day before the Royal Wedding in a dress by Issa.
LOOK 2: Leaving Buckingham Palace the day after the Royal Wedding, wearing a Zara dress. (Getty photos)
Zara Dress(18 of27)
Open Image ModalLOOK 1: Leaving Buckingham Palace the day after the Royal Wedding, wearing L. K. Bennett wedges.
LOOK 2: Celebrating Prince Phillip's 90th birthday on June 12, 2011 in a Jane Troughton brocade coat. (Getty photos)
Princess Diana's Repurposed Earrings(19 of27)
Open Image ModalLOOK 1: Paired with a Temperley London frock at Wimbledon on June 27, 2011.
LOOK 2: On the last day of her North America tour, in a Whistles ensemble. (Getty photos)
Amanda Wakeley Suit(20 of27)
Open Image ModalLOOK 1: Meeting with children at a soccer club in Darwen, north-west England on April 11 with a half-up hairdo.
LOOK 2: Posing for the official North American Tour portrait on June 3 in London with a sleek, natural-looking coif. (Getty photos)
Natalie Handbag By L.K. Bennett(21 of27)
Open Image ModalLOOK 1: Worn with a hand-painted, chinoiserie silk dress by Jenny Packham to a polo match in Santa Barbara on July 9, 2011.
LOOK 2: Worn with a canary yellow Jenny Packham dress at Calgary Airport two days earlier. (Getty photos)
Queen Elizabeth's Maple Leaf Brooch(22 of27)
Open Image ModalLOOK 1: Stuck on a red Catherine Walker coat during the couple's last hours in Canada.
LOOK 2: Pinned to a purple Issa dress on Canada Day. (Getty photos)
Suede Prada Pumps(23 of27)
Open Image ModalLOOK 1: At a welcome ceremony in Charlottetown, Canada on July 4, 2011, wearing an Alexander McQueen dress.
LOOK 2: Meeting participants in an Inner City Arts program in a Whistles skirt on July 10, 2011. (Getty photos)
Lavender Jenny Packham Dress (24 of27)
Open Image ModalLOOK 1: The wedding of Emily McCorquodale and James Hutt on July 7th, 2012, paired with her bronze pillbox hat and a gray Katherine Hoooker coat.LOOK 2: At Kate Middleton and Prince William's Royal Canada & California tour, on July 9, 2011.(Getty photos)
Blue Tweed Coat Dress By Missoni (25 of27)
Open Image ModalLOOK 1: Diamond Jubilee Event at Fortnum & Mason, March 1, 2012 LOOK 2: Diamond Julbille visit to Nottingham, June 13, 2012 (Getty photos)
Pink Pleated Dress(26 of27)
Open Image ModalLOOK 1: Sovereign Monarchs Jubilee Lunch in Kensington, May 18, 2012LOOK 2: Diamond Jubilee Party at Buckingham Palace, May 26, 2012 (Getty photos)
Alexander McQueen Sailor Dress(27 of27)
Open Image ModalLOOK 1: Canada tour in Prince Edward Island, July 5, 2011LOOK 2: Wimbledon, July 4, 2012(Getty photos)