to 45 years ago today, when Princess Margriet of the Netherlands wore a straw hat with upfolded halo brim to open the Canadian National Exhibition in Toronto.
Photo from Getty as indicated
Royal Hats
The Bold, Beautiful and Bizarre World of Royal Millinery
Royal Hats 
Found this website that shows the hat is pink with a shawl around (didn’t need that I think): http://www.aparchive.com/metadata/CANADA-NATIONAL-EXHIBITION/0a2840e4e26e9cfceccf17bf3357e03f?searchfilter=Compilations%2FPersonalities~%2FCANADA+NATIONAL+EXHIBITION%2F19617
Still looking for pictures of princess Beatrix on Prinsjesdag 1972: the hat look quite the same
Thanks, Dorie! It’s a lovely shade of pink and the video shows the hat is not a Breton (the brim of a Breton folds up all the way around the hat) but is actually, a Halo brim (a high fold on top that decreases down both sides of the hat).
Lovely lady, but it looks like she just fell off of a turnip truck!
Pretty princess! She is one of my favorites!
What a fabulous Breton hat! I want one! British Princess Margaret wore a few too as I recall.
Margriet looks simply gorgeous here! That hat and that brooch are wonderful.
Yes Jake and those earrings are not to shabby either!
I like this style because it is a big brimmed hat that allows the face to be seen. These should make a comeback.
Yes, it is a Breton! I loved these–hope they return someday. (Uncharacteristic image of Princess Margaret; I would not have recognized her if I hadn’t known it was she. Nice to see her looking so happy.)
Whoops, wrong Princess Margaret/Margriet. No wonder! Sorry. Still a great hat!
This hat style is a “Breton”. https://en.wikipedia.org/wiki/Breton_%28hat%29