52 years ago to September 2, 1970. Prince Ranier and Princess Grace of Monaco are shown here with Jacques Cousteau and his wife Simone, Princess Grace in a fantastic diagonal striped dress and matching turban.
Images from Getty as indicated
Royal Hats
The Bold, Beautiful and Bizarre World of Royal Millinery
Royal Hats 
I love those 70s stripes! The dress was previously worn with a simpler headpiece. I actually may prefer it for its simplicity.
May 25, 1970: Saint-Tropez, France
Embed from Getty Images
September 2- such great texture on this hat!
September 1:
Congratulations to Princess Ayako on the birth of her second son.
August 28: