41 photos that show how Kate Middleton's hats have evolved throughout the years

In celebration of January's National Hat Day and Middleton's 37th birthday on January 9, here's a look at some of the Duchess' most stylish hats over the years.

One of Middletons earliest headpieces was this black and brown feathered fascinator by Vivien Sheriff Millinery she wore in February 2011.

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She wore the subtle look a few months before she married Prince William in April 2011.

In June 2011, two months after the royal wedding, Middleton stepped out wearing this beige fascinator with a swirled ribbon detail.

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It's a classic example of Middleton's penchant for subtle, refined accessories.

Middleton wore this slightly larger than usual black hat designed by Sylvia Fletcher for Lock & Co. in June 2011.

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The hat featured a wide, inverted brim and a circular feather detail in the center.

She kept it casual with this white cowboy hat by Smithbilt while on a tour of North America in July 2011.

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Middleton wore the hat while watching a rodeo demonstration during her visit to Canada.

This wine-colored hat by Jane Corbett worn on Christmas day in 2011 is one of Middletons boldest looks.

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This was Middleton's first Christmas at Sandringham Church after marrying Prince William.

She went back to muted tones in March 2012 with this brown hat featuring a bow detail on the side by Lock & Co.

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The brown color went perfectly with her festive dark green ensemble.

She then brightened things up with this light pink Jane Taylor design with an asymmetrical slant in May 2012.

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The hat is trimmed with lace and bow embellishments.

Kate went with this bold red hat by Sylvia Fletcher and a matching dress in June 2012.

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It's one of Middleton's flashier choices with its bright color and floral detailing.

Two days later, Middleton wore this beaded, beige cocktail hat by Jane Taylor.

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The hat's net overlay swooped down to cover her right eye.

Middleton donned this lovely light blue hat designed by Jane Corbett for June 2012s Trooping the Colour.

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The hat featured a tilted design with an oversized bow at its center.

Middleton kept it bright with this white design by Jane Corbett later in June 2012.

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She went for another design with an elaborate bow.

It was back to black a few days later with this design by Sylvia Fletcher.

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The tilted brim and large bow add a whimsical effect to the hat's design.

For Prince Georges christening in October 2013, the Duchess went with a lovely cream-colored design by Jane Taylor.

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The off-white color perfectly matched Prince George's christening gown.

She then wore a green beret by Gina Foster on Christmas Day in 2013.

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The large bow gives it a nice festive touch.

Middleton effortlessly pulled off an all-red ensemble yet again in April 2014, wearing another hat designed by Gina Foster.

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The pillbox design was a nice change of pace from her usual style.

She then gave us one of her brightest looks yet with another design by Jane Taylor in April 2014.

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Its feathered detailing makes his hat more interesting.

She toned it back down with this gray design by Jane Taylor a few days later in April 2014.

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The hat gives her a classically elegant look.

Middleton then went for this eccentric hat by Jane Corbett in June 2014.

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The slanted design features an oversized ribbon bow underneath the brim.

She wore another light gray hat by Jane Taylor in June 2014.

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It matched perfectly with her jacket by Alexander McQueen.

Two days later, she went with a design in a similar color by Lock & Co.

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This design forgoes the typical ribbon and bow detailing for a less conventional, asymmetrical look.

Though the main piece of this Jane Taylor beret worn in August 2014 is Middletons signature shade of beige, the peachy, ruffled detail adds a nice pop of color.

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The hat is a great representation of Middleton's preference for classic designs with a modern twist.

It was back to brighter tones with another design by Jane Taylor this time in a lovely shade of pink.

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The hat includes a silk straw twist at the back.

Middleton chose this white, asymmetrical piece by Lock & Co. in June 2015.

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The design is made of straw with feather detailing down the middle.

For the christening of Princess Charlotte in July 2015, Middleton wore a white hat by Jane Taylor.

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The hat has a touch of floral detailing on the left side.

Middleton went with an understated design by Lock & Co. in February 2016.

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The dark color was a nice contrast to her bright blue Alexander McQueen coat.

In March 2016, she wore a more traditional hat a large, wide-brimmed design by John Boyd.

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This was a nice change of pace from the smaller hats Middleton is typically known to wear.

This bright piece by Philip Treacy added a subtle pop of color to Middletons hat collection in June 2016.

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The hat has a slanted design with an oversized fabric rose on the left side.

She kept the rose theme going in June 2016 with this design by Lock & Co.

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The hat features a swirled rose pattern within its teardrop shape.

A day later she donned another floral design this time by Jane Taylor.

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The main structure is a mesh disc with a rose detail and twisted ribbons in the center.

She took another bold step in blue with this hat by Sylvia Fletcher for Lock & Co. in September 2016.

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The hat is incredibly similar to the red one Middleton wore for the Diamond Jubilee Thames River Pageant in June 2012, expect this time it's blue and features maple leaves in its design.

For St. Patricks Day in March 2017, Middleton wore a dark green hat by Sylvia Fletcher for Lock & Co.

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The hat added an extra festive touch to her outfit.

She pulled out all the stops for sister Pippa Middletons wedding with this light pink hat by Jane Taylor.

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The hat has an intricate floral design in the middle.

Middleton then opted for a brighter shade of pink with yet another design by Jane Taylor in June 2017.

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The rippling ribbon detail around the edge adds a fun touch.

She went back to white a few days later with this elegant cocktail hat for the Royal Ascot.

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The hat features cream-colored silk flowers at the center of its lace design.

She proved that even royals arent above recycling outfits when she re-wore this design by Sylvia Fletcher for Lock & Co. in July 2017.

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Middleton first wore the hat during 2015's Trooping the Colour ceremony.

She recently kept it cozy with this warm black hat on Christmas Day in December 2017.

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She then proved she could keep it casual in a beanie during her visit to Sweden in January 2018.

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She wore a warm knitted design by Eugenia Kim.

For Meghan Markle and Prince Harrys wedding in May 2018, she wore a primrose yellow hat by Philip Treacy.

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She paired it with an Alexander McQueen dress in a style she had worn previously before.

She wore one of her most intricate designs yet for Trooping the Colour in July 2018.

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She wore a light-blue fascinator by Juliette Botterill with white floral detailing.

She also debuted a new hat during an event to mark the centenary of the RAF in July 2018.

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Middleton's Sean Barrett design featured a net overlay and swirling ribbons in the back.

She went with a bold shade of fuchsia for Princess Eugenies royal wedding in October 2018.

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The Philip Treacy hat featured a net overlay that extended in front of her eyes.

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41 photos that show how Kate Middleton's hats have evolved throughout the years

One of Middletons earliest headpieces was this black and brown feathered fascinator by Vivien Sheriff Millinery she wore in February 2011.

In June 2011, two months after the royal wedding, Middleton stepped out wearing this beige fascinator with a swirled ribbon detail.

Middleton wore this slightly larger than usual black hat designed by Sylvia Fletcher for Lock & Co. in June 2011.

She kept it casual with this white cowboy hat by Smithbilt while on a tour of North America in July 2011.

This wine-colored hat by Jane Corbett worn on Christmas day in 2011 is one of Middletons boldest looks.

She went back to muted tones in March 2012 with this brown hat featuring a bow detail on the side by Lock & Co.

She then brightened things up with this light pink Jane Taylor design with an asymmetrical slant in May 2012.

Kate went with this bold red hat by Sylvia Fletcher and a matching dress in June 2012.

Two days later, Middleton wore this beaded, beige cocktail hat by Jane Taylor.

Middleton donned this lovely light blue hat designed by Jane Corbett for June 2012s Trooping the Colour.

Middleton kept it bright with this white design by Jane Corbett later in June 2012.

It was back to black a few days later with this design by Sylvia Fletcher.

For Prince Georges christening in October 2013, the Duchess went with a lovely cream-colored design by Jane Taylor.

She then wore a green beret by Gina Foster on Christmas Day in 2013.

Middleton effortlessly pulled off an all-red ensemble yet again in April 2014, wearing another hat designed by Gina Foster.

She then gave us one of her brightest looks yet with another design by Jane Taylor in April 2014.

She toned it back down with this gray design by Jane Taylor a few days later in April 2014.

Middleton then went for this eccentric hat by Jane Corbett in June 2014.

She wore another light gray hat by Jane Taylor in June 2014.

Two days later, she went with a design in a similar color by Lock & Co.

Though the main piece of this Jane Taylor beret worn in August 2014 is Middletons signature shade of beige, the peachy, ruffled detail adds a nice pop of color.

It was back to brighter tones with another design by Jane Taylor this time in a lovely shade of pink.

Middleton chose this white, asymmetrical piece by Lock & Co. in June 2015.

For the christening of Princess Charlotte in July 2015, Middleton wore a white hat by Jane Taylor.

Middleton went with an understated design by Lock & Co. in February 2016.

In March 2016, she wore a more traditional hat a large, wide-brimmed design by John Boyd.

This bright piece by Philip Treacy added a subtle pop of color to Middletons hat collection in June 2016.

She kept the rose theme going in June 2016 with this design by Lock & Co.

A day later she donned another floral design this time by Jane Taylor.

She took another bold step in blue with this hat by Sylvia Fletcher for Lock & Co. in September 2016.

For St. Patricks Day in March 2017, Middleton wore a dark green hat by Sylvia Fletcher for Lock & Co.

She pulled out all the stops for sister Pippa Middletons wedding with this light pink hat by Jane Taylor.

Middleton then opted for a brighter shade of pink with yet another design by Jane Taylor in June 2017.

She went back to white a few days later with this elegant cocktail hat for the Royal Ascot.

She proved that even royals arent above recycling outfits when she re-wore this design by Sylvia Fletcher for Lock & Co. in July 2017.

She recently kept it cozy with this warm black hat on Christmas Day in December 2017.

She then proved she could keep it casual in a beanie during her visit to Sweden in January 2018.

For Meghan Markle and Prince Harrys wedding in May 2018, she wore a primrose yellow hat by Philip Treacy.

She wore one of her most intricate designs yet for Trooping the Colour in July 2018.

She also debuted a new hat during an event to mark the centenary of the RAF in July 2018.

She went with a bold shade of fuchsia for Princess Eugenies royal wedding in October 2018.