Kate Middleton's Fashion Transformation Is Truly One For The Books

In celebration of the publication of “Hold Still” in May 2021, Middleton wore a coat as a dress, buttoning the long red silhouette from top to bottom and pairing it with neutral camel accessories.

Middleton visited the Manor Farm in Little Stainton, Durham, with her family in April 2021, keeping it casual in a fair isle sweater, skinny jeans, knee-high boots, and a Barbour jacket on top.

The Duchess paid a visit to School 21 in March 2021, adding a pop of color to her black trousers by way of a pink crewneck sweater and a matching coat.

She participated in an event at the SportsAid Stars event in February 2020, wearing a pair of emerald green culottes and matching ribbed top, finished off with sneakers — of course.

At Ely and Careau Children’s Centre in 2020, Middleton went classic with a double-breasted camel coat that she threw on over a black turtleneck and black suede boots.

Middleton visited Cardiff Castle in December 2020 in Christmas red, topping a seasonally-festive plaid skirt with a deep red coat.

Middleton hosted a Gala Dinner for Place2Be in March 2020, stunning in a deep blue gown that boasted sheer sleeves and an allover embellished top.

Wearing the official color of Ireland, Middleton visited the country in March 2020 wearing a metallic green midi dress from The Vampire’s Wife

Middleton showed her support for the Irish people, wearing the country’s color during an official visit in March of 2020.

Middleton went for a Grecian-inspired look in February 2020, wearing a white and gold gown embellished from tip to toe and finished off with gold glitter heels.

Middleton loves a monochromatic look, choosing a bright red dress and matching suede shoes for an international summit. The dress is crafted with allover embellishment to make it perfectly evening-appropriate while still subtle in a classic midi silhouette.

To visit the Family Nurse Partnership, Middleton kept it casual in a pair of high-waisted cropped black pants and a black polka-dot silk button-down.

For Wimbledon in 2018, Middleton arrived with Meghan Markle at her side, wearing a white polka dot knee-length dress that was reminiscent of many worn by her late mother-in-law, Princess Diana.

For 2018’s royal tour, Middleton chose a more brightly coat than she has in the past, featuring a bright red-and-white houndstooth check. In one hand was an elegant top-handle Chanel bag.

Standing out in red while visiting Canada in 2016, Middleton slipped into a sleeveless midi dress in bright red with a pair of matching suede pointed-toe heels.

When visiting Australia and New Zealand in 2014, Middleton chose a two-piece set, matching in a pale pink peplum top and knee-length skirt.

After giving birth to their first son, Prince George, Middleton wore a light blue dress with polka dots that many likened to the polka dot dress Princess Diana chose after giving birth to Prince William.

For the BAFTA event in 2011, Middleton went glam in a long silk dress, made of a pale purple tone and nipped in at the waist.

Middleton went retro in a pale yellow 1940s-inspired frock with a shirtdress silhouette and flounce skirt.

For her wedding, Middleton chose a long-sleeve white lace dress with billowing train, designed by Sarah Burton of Alexander McQueen.

To announce their engagement, Middleton chose a classic blue dress with a wrapped waistline, conservatively hitting just at her knees.

Knee-high boots were a staple in Middleton's wardrobe pre-royalty, styled here with black tights, a blazer, and an eye-catching printed dress.

Always a fan of headwear, Kate's brown Western hat is a far cry from the fascinators of today.

For casual looks in the past, Kate was known to throw on a lace-trimmed cami and low-slung jeans, accented by a wide, braided belt.

Kate opted for a statement skirt for a summer wedding, styling the lace paneled piece with pointy heels and a white blazer. Her style became much more subdued as the years went on.