Meghan was more restrained – simple white, at a moderate angle – while Camilla went for cream in a slightly larger size.
Rather surprisingly, nobody saw fit to wear a corgi hat.
Her Majesty missed the Epsom Derby too – telly to the rescue again – and it's there that some of the world's maddest hattery is on display.
At these races you might see flying saucers, flat discs, fire hydrants, oversized confectionery, inverted woks, flourishes of flowers or generously-stocked fruit bowls. I can reliably report that the rakish angle is still the new black.
And in past years there have been butterfly hats. One photograph I have seen shows a cluster of butterflies – definitely upwards of 12 – all attracted to something on the wearer's head and displaying a bewildering kaleidoscope of primary colours. It's a butterfly bonanza.
Another was more restrained and limited itself to just one butterfly. But it was a very large butterfly, probably shagged out after its fluttery flight and looking for a place to rest. It could certainly be used as a prop in a movie called "The Attack of the Killer Butterflies".
One favourite looks like a cloud of pastel pink candy floss which floats out over both the wearer's shoulders. Unfortunately, it looks as though it would attract flies.
Another one I can only describe as a small yellow thing. Perhaps it was some sort of art installation.
All of this discussion has made me painfully aware that I only have three hats. Well, you do have to put a cap on these things.
Wait a moment. I've just remembered it's five if you count the beanies.
I have "my best" (a bespoke piece created by a classy milliner in Petone), a more casual checked paperboy cap (also made by the same milliner) and an ordinary sensibly-priced piece of headwear I would describe as my "gardening hat".
The beanies are not really worth describing, though if I had to come up with an appropriate adjective it would probably be "awful".
So if I had been able to accept my invitation to the Epsom Derby (I had a prior engagement), I know the beanies, the gardening hat and the cap would have been inappropriate. But I might have scraped in with "my best", though I would have had to wear it at an original and interesting angle.
Unfortunately, I can't think of an angle that hasn't already been done. Well, not off the top of my head.
Wyn Drabble is a teacher of English, a writer, musician and public speaker.