Speaking of whimsical hats… is there any more so than the green marble run?! It was worn in October 2000 on a state visit to Italy and in November that same year for the Inauguration Of The General Synod Of The Church Of England.
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Interestingly… this was not the only statement green hat Her Majesty wore around the turn of the new millennium!
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Image from Getty as indicated
Royal Hats 
June 22, 2008 (EIGHT years later!)
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This hat is so much fun – does anyone remember the Mousetrap game? The 4th statement green hat, worn with the same coat, is better, though, using the same material as the dress. HM got a lot more wear with the 2nd combination.
What a fabulous hat. I agree that the back is the star, but am impressed the Queen can carry it off the front as well as she does!
I adore this hat – from the back! It’s a stunning piece of millinery and a lot of fun. Just from the front it’s not all that flattering. I almost wish it had been made to be worn the other way round, as that’s the fun of it.
I was always a fan of the fern straw hat with the side knot, that had just the right level of whimsy.
Not my favourite shape or style for The Queen but the back view of this hat is amazing.
The selection of other green hats from the time is lovely with the top left my favourite. Absolutely gorgeous. And a beautiful selection of brooches.