Every year, people wear their finest suits, dresses, and hats for Royal Ascot, a horse-racing event at Ascot Racecourse in Berkshire, England.
The racecourse, which was founded in 1711 by Queen Anne, hosts members of the royal family for the event, but Kate Middleton had been married to Prince William for more than five years before she finally made her debut.
Since her inaugural appearance in 2016, she's been wearing elegant dresses, eye-catching hats, and heirloom jewelry. For this year's event, which was held from Tuesday to Saturday, she stepped out in her boldest Ascot look to date with a vivid red dress by Alexander McQueen.
Here's a look at Kate's Royal Ascot outfits, including her hats, throughout the years.