The ladies up the glitz and glamor as they take center stage at Ascot on Thursday when the horses also race for the prestigious Gold Cup.
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Ladies' Day at Royal Ascot is a chance to channel your inner Audrey Hepburn, pictured in a scene from the famous meeting in the film "My Fair Lady."
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The lady behind many of the Royal Ascot hats is local designer Ilda Di Vico, whose creations retail between $150 to $4800.
(Photo by Kirstin Sinclair/Getty Images for Ascot Racecourse
"We've spotted a lot of fluorescents," Di Vico tells CNN. "The perfect Ascot hat has to be elegant with a touch of wow."
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White and ivory was also a trend on Ladies' Day in 2015 as shown here by retro girl band The Tootsie Rollers.
(Photo by Kirstin Sinclair/Getty Images for Ascot Racecourse
"The ladies go to a hell of a lot of effort on Ladies' Day," says horse racing journalist Oliver Brett, who attempted to seek shade under this fantastically large creation.
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Bookmakers at Royal Ascot take bets on what color hat the Queen will wear on each day of the five-day meeting. Queen Elizabeth II chose a light shade of green for Ladies' Day.
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There are no questions asked for members of the Royal Family seeking entry to the Royal Enclosure but everyone else must wear a hat and formal attire.
Hollywood actor Damian Lewis adopted the gentlemen's dress code of top hat and tails as he paid a visit to Royal Ascot in 2015.
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The high-quality horse racing inspired an equine hat for this racegoer.
(Photo by Kirstin Sinclair/Getty Images for Ascot Racecourse
Even guide dogs choose to stick to the guidelines on Royal Ascot's strict dress code on Ladies' Day.
(Photo by Kirstin Sinclair/Getty Images for Ascot Racecourse