The black-and-pink hat appears to be a repeat from 2011.
The Queen Wore a Pink Coat. The World Went Wild.
Queen's 96th birthday: Celebrating Her Majesty's colour blocking outfits
PHOTOS: Queen Elizabeth II's style through the decades
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Kate Middleton's Best Outfits
The original Regal Recycler: Queen Elizabeth II made a habit of re-using favourite outfits long before the younger royals caught on
Queen Elizabeth Wears Gorgeous Pink Outfit for Royal Ascot: Photos
Fashion at the coronation: What the guests wore
Queen Elizabeth Wore a Hot-Pink Coat and Coordinating Hat at Her Latest Appearance
Queen Elizabeth Wore a Hot-Pink Coat and Coordinating Hat at Her Latest Appearance