01of 15MAY 2006GettyThey had been dating for years, butPrince Williamand Princess Kate — thenKate Middleton— took the next step in their public relationship, attending the wedding of William’s step-sibling, Laura Parker Bowles. For the occasion, Kate chose an outfit that served as inspiration for pretty much every wedding she’s attended since: stylish coat and a fascinator.

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MAY 2006

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They had been dating for years, butPrince Williamand Princess Kate — thenKate Middleton— took the next step in their public relationship, attending the wedding of William’s step-sibling, Laura Parker Bowles. For the occasion, Kate chose an outfit that served as inspiration for pretty much every wedding she’s attended since: stylish coat and a fascinator.

02of 15MAY 2007GettyHaving a prince for a boyfriend means you’ll be spending a lot of afternoons on the polo field. Kate kept it chic while doing so, wearing a navy sweater paired with a white skirt for an afternoon at the Badminton Horse Trials.

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MAY 2007

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Having a prince for a boyfriend means you’ll be spending a lot of afternoons on the polo field. Kate kept it chic while doing so, wearing a navy sweater paired with a white skirt for an afternoon at the Badminton Horse Trials.

03of 15JUNE 2008GettyFor William’s induction into the historic Order of the Garter, Kate wore a fitted black suit and a black-and-white hat — and giggled with Harry.

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JUNE 2008

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For William’s induction into the historic Order of the Garter, Kate wore a fitted black suit and a black-and-white hat — and giggled with Harry.

04of 15NOVEMBER 2010GettyIt was the look that started the “Kate effect” — theroyalblue Issa London wrap dress. That the frock matched her sapphire engagement ring was just an added bonus.

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NOVEMBER 2010

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It was the look that started the “Kate effect” — theroyalblue Issa London wrap dress. That the frock matched her sapphire engagement ring was just an added bonus.

05of 15FEBRUARY 2011GettyDuring an engagement-era visit to their alma mater, Kate rocked a bright red-suit — and proved it’s clearly her color (then again, what’s not?).

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FEBRUARY 2011

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During an engagement-era visit to their alma mater, Kate rocked a bright red-suit — and proved it’s clearly her color (then again, what’s not?).

06of 15APRIL 2011GettyKate’s worn a lot of gorgeous pieces over the past 10 years, but really, does anything (or will anything ever) top her Sarah Burton-designed wedding gown? Probably not.

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APRIL 2011

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Kate’s worn a lot of gorgeous pieces over the past 10 years, but really, does anything (or will anything ever) top her Sarah Burton-designed wedding gown? Probably not.

07of 15JUNE 2011GettyNot even three months after her wedding, Kate stunned from the start of her North American tour in a navy lace dress from Erdem.

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JUNE 2011

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Not even three months after her wedding, Kate stunned from the start of her North American tour in a navy lace dress from Erdem.

08of 15JULY 2011GettyLater on during the visit, she hit the red carpet in Los Angeles looking every inch the glamorous Hollywood star — or, you know, princess — in a lavender dress from one of her go-to designers, Jenny Packham.

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JULY 2011

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Later on during the visit, she hit the red carpet in Los Angeles looking every inch the glamorous Hollywood star — or, you know, princess — in a lavender dress from one of her go-to designers, Jenny Packham.

09of 15MAY 2012GettyPrincess Kate’s sleek white dress for a London dinner looked demure — until we saw that daring slit up the side. She wore the dress again — this time, with an updo — to theMandela: Long Walk to Freedompremiere in 2013.

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MAY 2012

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Princess Kate’s sleek white dress for a London dinner looked demure — until we saw that daring slit up the side. She wore the dress again — this time, with an updo — to theMandela: Long Walk to Freedompremiere in 2013.

10of 15MAY 2012GettyThat same month, she wore another red-carpet worthy ensemble, a teal dress with an intricate lace back.

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That same month, she wore another red-carpet worthy ensemble, a teal dress with an intricate lace back.

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APRIL 2013

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12of 15JULY 2013GettyIn what would soon become one of the most iconic images of the couple, Will and Kate debuted their newborn son,Prince George, on the steps of the Lindo Wing of St. Mary’s Hospital in London. Kate wore a bespoke polka-dot dress from Jenny Packham, paying homage to William’s late mother, Princess Diana, who wore polka dots on the same hospital steps when she introducedPrince Williamto the world 31 years prior.

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JULY 2013

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In what would soon become one of the most iconic images of the couple, Will and Kate debuted their newborn son,Prince George, on the steps of the Lindo Wing of St. Mary’s Hospital in London. Kate wore a bespoke polka-dot dress from Jenny Packham, paying homage to William’s late mother, Princess Diana, who wore polka dots on the same hospital steps when she introducedPrince Williamto the world 31 years prior.

13of 15OCTOBER 2013GettyWhen it comes to casual wear, Kate sticks to what she likes. And what she likes are striped shirts, skinny jeans, navy blazers and cork wedges, which she’s pretty much worn on rotation since her wedding. Hey, if it ain’t broke …

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OCTOBER 2013

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When it comes to casual wear, Kate sticks to what she likes. And what she likes are striped shirts, skinny jeans, navy blazers and cork wedges, which she’s pretty much worn on rotation since her wedding. Hey, if it ain’t broke …

14of 15APRIL 2014GettyKate worea lotof fashionable outfits on the 2014 royal tour to New Zealand and Australia, but this white-and-blue floral dress from L.K. Bennett just may be the winner. Celebs agree: It turned Mindy Kaling and Uzo Aduba into “copy-Kates” — both wore the dress after the princess did.

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APRIL 2014

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Kate worea lotof fashionable outfits on the 2014 royal tour to New Zealand and Australia, but this white-and-blue floral dress from L.K. Bennett just may be the winner. Celebs agree: It turned Mindy Kaling and Uzo Aduba into “copy-Kates” — both wore the dress after the princess did.

15of 15OCTOBER 2015GettyProving her fashion game is just getting started, Kate rocked a red, white and blue floral gown from Erdem for a gala dinner in London last week. May her sartorial reign continue!

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OCTOBER 2015

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Proving her fashion game is just getting started, Kate rocked a red, white and blue floral gown from Erdem for a gala dinner in London last week. May her sartorial reign continue!

source: people.com