63 years ago to this day in 1960 when Princess Grace of Monaco wore a delicate floral calot headpiece to award the winner of the Monaco Grand Prix.
I am taking some time for travel and study over the next few weeks, before celebrating 10 years of covering Royal Ascot here by attending the first three days of the races, in person! If there are any royal hats worn today or tomorrow, please share them in the comments here.
Images from Getty as indicated
Royal Hats 
For literally a second at 4:57 you’ll see PG’s hat is blue. The dress is white with blue flowers.
The winner of the Monaco Grand Prix in 1960, also pictured, was the inimitable Englishman Stirling Moss (1929-2020). From his Wikipedia entry: His father was an amateur racing driver, who had come 16th in the 1924 Indianapolis 500, and his mother had also been involved in motorsport, entering into hillclimbs at the wheel of a Singer Nine. Moss was a gifted horse rider, as was his younger sister, Pat Moss, who went on to become a successful rally driver.
They sound like an interesting family.
How exciting to attend Ascot! Have a Hat-Heaven-Wonderful time!!!!
I’m so thrilled you will be attending Ascot, dear HatQueen! I hope it’s everything you hope and beyond!