The Duke & Duchess of Devonshire arrived with the king and queen in the royal carriage procession, the Duchess in a deep pink domed pillbox rimmed in striped vibrantly dyed feathers.
Lady Susan Hussey
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Dame Judi Dench and her partner David Mills were also in the carriage procession
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I believe this is Laura Lopes, Queen Camilla’s daughter
Which other hats stood out to you on Day 4 of the races?
Images from Getty as indicated
Royal Hats 
How I wish we had better views of the Duchess of Devonshire’s pillbox! I love me some Lady Amherst pheasant feathers, and this just looks like a fabulous hat.
Not surprised at Dame Judi Dench showing up in what looks to be an off-the-peg toyo straw fedora, but she managed to make it work by placing it at a jaunty angle.
P.S. Princess Zahra Aga Khan and her daughter Sara (wearing a RTM hat) were also present on Day 4:
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Just to say thanks for all your splendid coverage, HatQueen, and how much I’ve enjoyed seeing your own hats with their lovely flowers.