to this undated photo of Empress Kōjun (mother of Emperor Akihito, wife of the late Emperor Hirohito) in a wonderful hat with wide, pleated brim overlaid in feathers.
Photo from Getty as indicated
Royal Hats
The Bold, Beautiful and Bizarre World of Royal Millinery
Royal Hats 
Thanks for including this photo HatQueen; it’s nice too look back on non-European royals as well, and this is a great hat!
That is such a very different style from what we see her daughter-in-law wear. It reminds me of the sort of hat worn by the Queen Mother when she was Duchess if York.
Yes, the empress and the queen mother were contemporaries. The queen was born in 1900; the empress in 1903.
Stunning! Yes, it is very similar to the future QE the QM of this period.