to this day in 1983 that saw Princess Alexandra visit RAF Benson in Oxfordshire in a fur-trimmed hat and coat fit for a snow queen.
Thanks to reader Jake for suggesting this hat!
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Photos from Getty as indicated
Royal Hats 
Now that’s a lot of hat and coat! Notice very faintly that the crown matches the the coat.
I found several earlier photos of the same coat, and probably the same hat, worn to the christening of the Earl of Ulster in February 1975.
Could this be a different combination? (Shutterstock)
https://www.shutterstock.com/editorial/image-editorial/prince-of-wales-1975-picture-shows-prince-charles-and-princess-alexandra-of-kent-at-the-christening-of-the-earl-of-ulster-891365a
It looks like the same ensemble to me.
Ahh, the always elegant Princess Alexandra! Few people could carry this ensemble off!
Yes, she looks a bit like a snow queen. Just love this look!
She looks like a (much kinder) Snow Queen from Narnia. I love it.
Goodness. The hat is beautiful, but the cuffs are huge!! I agree that P. Alexandra does carry it off, though. And that smile … !
Those cuffs are each way larger than the hat, aren’t they? Fabulous look.
It’s certainly a winter winner isn’t it. On nearly everyone else it would be ridiculous, but somehow Alexandra more than carries it off. Love it.
Exactly, JamesB!