Princess Mako of Akishinono attended a war memorial service this morning at Chidorigafuchi National Cemetery in Tokyo. She looked very smart in a quirky little black hat with squared crown and tightly upturned brim
Photos from Getty as indicated and The Imperial Family of Japan
Royal Hats 
The Japanese do these very small hat with great aplomb. The hat makes the wearer look so innocent. I like the hat, it fits their style.
I dint like the hat at all, sorry it just falls flat. The suit I do like but I just don’t get the Japanese obsession with white gloves. White gloves are fine with light clothing or with white shoes and handbag but I think here (and in most other cases) a pair of black or grey gloves would be better.