Step Aside, Kate and Meghan, We Have a New Royal Fashion Icon in Our Midst

Bucking the trend for dresses at Royal Ascot, Autumn looked modern and chic in a duck-egg-blue crepe jumpsuit by Claire Mischevani with a Sally Ann Provan hat.

For her first Ascot appearance, Autumn wore a Claire Mischevani floral dress with Emmy London accessories and a hat by Bee Smith.

In another design by Claire Mischevani, Autumn's festive coat featured a leopard-print lining. She teamed it with a Sally Ann Provan hat and stiletto heels by Emmy.

For Princess Eugenie's wedding, Autumn chose a green midi dress, teamed with her Emmy London heels and a matching hat.

Autumn stood out in a fuchsia outfit with beige accessories at Royal Ascot in 2018.

For Prince Harry and Meghan's wedding, Autumn took a leaf out of the Duchess of Cambridge's book, choosing a timeless coat dress in cobalt blue.

For the annual Easter service in 2018, Autumn wore a simple single-breasted coat in icy pale blue with matching accessories.

Autumn showed she can glam up in a one-shouldered black evening gown for a night out with husband Peter.

A bold blue coat made Autumn stand out at the Easter service in 2017.

A peacock-green shift dress with a matching gold and green hat gave Autumn a slightly retro look as she attended the Queen's birthday service.

A bubblegum-pink coat looked fresh and fun for the Easter service in 2016.

Supporting Prince Harry's charity, Autumn slipped into a formfitting cobalt dress with black accessories.

Autumn showed off her fashion chops when she slipped into a caped jacket with a gold belt for the Easter service in 2015.

Chatting with Princess Beatrice at Royal Ascot, Autumn definitely caught people's attention with her gathered green dress and cream hat.

Catching up with Sophie Winkleman (aka Lady Frederick Windsor) at William and Kate's wedding, Autumn showed off her iridescent silver and grey fit-and-flare coat.

For her first appearance at Royal Ascot as an official member of the royal family, Autumn let her hot-pink hat do all the talking.

On her wedding day, Autumn wore a dress by British designer Sassi Holford, which featured a beaded lace bodice, a silk duchesse skirt, and a lace shrug. Her tiara was borrowed from Princess Anne.