61 years ago to January 1961 and a ski holiday in Switzerland that saw Queen Sirikit of Thailand step out in this white fur hat, the epitome of royal ski-bunny couture!
Images from Getty as indicated
Royal Hats
The Bold, Beautiful and Bizarre World of Royal Millinery
Royal Hats 
Charming! I thought I remembered another royal snow bunny, but this is the closest I can find: https://royalhats.net/2017/02/27/hat-from-the-past-72/
Maybe you’re thinking of this Snow Queen post from 2021?
I wasn’t, but I’m happy to revisit this magnificent look! I did find the image I was looking for on Getty — Michiko in 1967, but I can’t seem to embed it. Can you help? Also, check your email for another skiing royal in a fur hat
Do you mean this one? https://www.gettyimages.co.uk/detail/news-photo/crown-prince-akihito-and-crown-princess-michiko-enjoy-news-photo/1246925856
Unfortunately, a vast majority of Imperial photos on Getty are not embeddable. In this case, it’s fine to share a link to the Getty Image, as above.
Yes, that’s it! And here’s the other photo of a royal skiing in a fur hat: Embed from Getty Images