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Kate Middleton may not have been born into royalty, but she certainly knows how to look regal.
Middleton, who became the Duchess of Cambridge when she married her college sweetheart Prince William in 2011, has lived much of her adult life in the public eye. In that time, she's become a major fashion icon. In fact, her style is so beloved, she's created a phenomenon called the Duchess Effect: When Kate wears something, it almost instantly sells out.
Here's a look at 43 of her most iconic ensembles that show how her style has changed.
Here's how Kate looked on June 23, 2005: The day of her graduation from St. Andrew's University.
Kate loves to wear delicate jewelry with her outfits.
Getty/Handout
By the time Kate earned her diploma in the history of art, she and Prince William had already been dating for about two years.
She tried out an eccentric feathered hat as William's wedding guest in 2006.
Kate has worn statement hats on a number of occasions.
Getty/Chris Jackson
A few months later, she rocked a hat with ribbons shaped like a giant heart.
The large hat and bright color of her jacket are far from her more subdued style.
AP/Kristy Wigglesworth
In 2008, she wore a simple white coat and black boots while she watched William earn his royal air force wings.
Kate loves to wear A-line skirts, like the one on this coat.
AP/Michael Dunlea
The pair announced their engagement in November 2010, and Kate's blue wrap dress from designer Issa almost instantly sold out.
Her royal navy dress is one of her most iconic looks.
Getty/Chris Jackson
She chose a simple but striking gown for a film screening in December 2013.
The oversized necklace is an unusual choice for Kate, who usually wears understated jewelry.
Getty/Anthony Harvey
Kate wore this sleek ensemble to Easter Sunday service in 2014.
Kate owns many other outfits in a similar cut to this one.
Getty/Brendan Thorne
She channeled Jackie Kennedy upon her arrival in New Zealand in 2014. It was Prince George's first royal trip.
Despite wearing more subdued tones since becoming a mom, Kate wore a pop of color for this trip.
Getty/Hagen Hopkins
On the same trip, Kate stood out in this white and yellow color-block dress, complete with a sharp square neckline. It's a notable departure from her usually monochromatic outfits.
Her vacation wardrobe is more vibrant than her usual attire.
Getty/Cameron Spencer
We can't help but think she made a purposeful decision to wear bright blue during a visit to the Tower of London's Ceramic Poppy Field in November 2014.
Like many of her outfits, this modest blue ensemble stops just beneath her knees.
Getty/Stuart C. Wilson
Kate has worn this midnight-blue gown on several occasions, including a 2014 dinner in New York City.
This glamorous gown is a more sophisticated version of the colorful pleated dresses she has worn before.
Getty/Pool
She showed off her second baby bump in this timeless navy ensemble after a church service in March 2015.
Many of Kate's outfits include a dress with a matching coat and fascinator.
Getty/Chris Jackson
She wore a sunny floral pattern to announce the birth of Princess Charlotte in May 2015.
Kate returns to wearing more print dresses.
Getty/Ian Gavan
Kate's plum lace turtleneck dress looked sophisticated during her visit to China in October 2015.
She often coordinates the color of her outfits with her shoes.
Getty/Chris Jackson
The henna-esque patterns on this dress were perfect during Kate's April 2016 visit to New Delhi, India.
Kate wears some of her best outfits on royal visits.
Getty/Mark Large/Pool
For a charity dinner event in summer 2016, Kate opted for a sexier silhouette than usual.
She pulled off the cold-shoulder trend in her go-to shade of blue.
Getty/Eddie Mulholland/WPA Pool
This beaded number oozes old Hollywood glamour. Kate wore it to a gala dinner in summer 2016.
Kate traded in pleats for straight-falling dresses.
Getty/Stephen Pond
She wore this bold pattern to a royal engagement in August 2016.
Florals have become an integral part of her wardrobe.
Getty/Eddie Mulholland/WPA Pool
On a September 2016 tour of Canada, Kate stunned in this tea-length red gown with an asymmetrical neckline.
Note the very appropriate maple leaf pin.
Getty/Chris Jackson
On the same trip, she even coordinated her outfit with George and Charlotte's.
Her tailored dresses are the epitome of royal elegance.
Getty Images/Chris Jackson
In December 2016, Kate paired her red gown with one of Princess Diana's tiaras for the annual Diplomatic Corps reception at Buckingham Palace.
She has worn Princess Diana's tiara again since this picture was taken.
Getty/Pool
In April 2017, Kate wore a more casual, preppy ensemble for a charity event at Kensington Palace.
Her $65 Superga sneakers made headlines after she wore them.
ASSOCIATED PRESS
At her sister Pippa Middleton's wedding in May, Kate wore a blush-pink, below-the-knee dress with a statement hat.
Prince George and Princess Charlotte were also in formal wedding attire.
Getty/WPA Pool
Also in May 2017, Kate was spotted wearing a floral dress from the French designer Rochas with a pair of patent cream court heels from L.K. Bennett.
The $1,950 midi dress sold out within hours of Kate wearing it.
Associated Press
At London's Victoria & Albert Museum in June 2017, Middleton sported an above-the-knee tweed Gucci dress and wore her hair in a retro half-up, half-down style.
This chic style is an unexpected look for the summer, but the Duchess of Cambridge pulled it off.
WPA Pool/Getty Images
On July 3, 2017, Kate debuted a shorter haircut with a fun polka dot dress from Dolce & Gabbana at Wimbledon.
She also mixed up her footwear, wearing a pair of block heel sandals.
WPA Pool/Getty Images
The Duchess of Cambridge mixed colors wearing a powder blue Preen dress with a pair of strappy purple Prada heels to an event at the Natural History Museum on July 13, 2017.
The shoes were a bold choice for Kate, who usually wears more conservative styles.
WPA Pool/Getty Images
On July 17, 2017, Kate wore a crisp white skirt-suit with a peplum waist for a visit to Poland. She added a red clutch for a pop of color.
She accessorized her outfit with a pair of beige suede heels and understated jewelry.
KGC-178/STAR MAX/IPx/ASSOCIATED PRESS
