In 1974, Queen Elizabeth wore this helmet-shaped brimless green hat draped with the same blue and green printed silk several times. The highest profile wearing was on June 16 at the French Prix de Diane in Chantilly when her horse, Highclere, won the race.
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Embed from Getty Images
Image from Getty as indicated
Royal Hats 
May 3/4, 1976: Queen Elizabeth greeting Brazilian President Ernesto Geisel
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Sorry, I keep adding to a long past post. This short video is a very nice discovery.
Brilliant addition!
April 24, 1975: St. George’s Windsor Service of Thanksgiving
https://www.alamy.com/24th-april-1975-queen-elizabeth-ii-with-dr-fleming-dean-of-windsor-after-she-had-attended-a-service-of-thanksgiving-at-st-georges-chapel-with-members-of-the-royal-family-image268816713.html
May 5, 1975: Guam
June, 1975: Royal Hospital Chelsea, London
https://www.alamy.com/search/imageresults.aspx?imgt=0&qt=queen+elizabeth++june+1975+pensioners
This is a gorgeous hat and a very cute outfit. The Queen looks positively luminous here.
I wonder if oversized – dare I say gigantic – lapels will make a comeback?
My mother always said that everything comes back in style eventually if you wait long enough, but always with just enough difference that you won’t be able to wear any of the clothing from the previous iteration of that style if you saved any.
A wise woman!
This is such a peak 70s look! Those lapels… I really like this one (for its time), and this is bang in her ‘helmet with something going on round the back’ phase (a shorter description is maybe needed…) It’s a gorgeous shade of green and I particularly love it worn it just with the dress, very Margot Leadbetter.
Also I followed the link of the journalist who shared the pic of the hat and his book ‘Elizabeth II Les chapeaux de la couronne’ looks like a must have.
It absolutely is! It was my pleasure to assist with identifying milliners of several hats included in this book.
A”helmet plus”.
This is so interesting to see the close up of this beautifully made hat. It looks very chic on Queen Elizabeth with the strong green coat and the silk dress.