The prestigious Royal Ascot has strict rules when it comes to the dress code for those attending the high-society event. For ladies, the more eye-catching the hat the better, or so it seems.
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For the first time in Royal Ascot's history, men attending the event were allowed to remove their jackets as the mercury hit record temperatures in England this week.
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Some restrictions still remained. Women in the Royal Enclosure must not expose their shoulders, although ladies are permitted to wear jumpsuits this year for the first time in the event's history -- as long as they reach to the ankle.
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As they have done on every day this week, on day four bookmakers took bets on the color of the hat to be worn by Queen Elizabeth II.
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A horse enthusiast, Queen Elizabeth II has attended Royal Ascot every year since she came to the throne in 1952.
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On the track, Ryan Moore, riding the unbeaten Caravaggio, won the Commonwealth Cup. It was Caravaggio's sixth win of his career.
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French-trained Different League, at 20-1, was the surprise winner of the Albany Stakes, the opening race of the day.
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Jockey Antoine Hamelin could not contain his joy and celebrated winning the Albany Stakes with owner Con Marnane
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Up to 300,000 people are expected to descend on Ascot over the course of five days. One racegoer, Rita Lockley, from Shrewsbury, caught the eye with this stunning blue floral hat.
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Royal Ascot is about the racing -- and the hats and the bolder the outfit the better.
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William Buick, riding the Mark Johnston-trained Permian, won The King Edward VII Stakes. The victory made up for the Permian's disappointing run in the Epsom Derby.