She does look great, and I'm even behind the furry boots. I do wonder how she managed to get this dress from Dior though.
Decades confirmed in a comment on Instagram that it's from them. Perhaps it was a loan or she bought it, not specified.
I was just wondering how some celebs can get archival samples dresses amended. I think given the animosity of the creative directors, some may be a bit reluctant to promote designs under a previous CD. So I certainly think she paid for this.

I always love it when celebs wear Loewe.