thirty-nine years ago to September 19, 1981 when Prince Hitachi and Princess Hanako visited the United States. For a stop in Denver, Princess Hanko wore a very jaunty Breton hat with two-toned brim.
Photo from Getty as indicated
Royal Hats
The Bold, Beautiful and Bizarre World of Royal Millinery
Royal Hats 
It’s interesting to see other royals in this style which was so strongly associated with the young Princess of Wales right around the same time.
Only one other outing of this hat was found, at the Japan Red Cross Society meeting – again in black and white, and not embeddable either!
Have a nice weekend, hat lovers, I’m pooped!
May 25, 1983: Tokyo, Japan
https://www.gettyimages.com/detail/news-photo/princess-hanako-of-hitachi-princess-setsuko-of-chichibu-and-news-photo/1064116844