Considering the rest of the guests (apart from Grace Jones, she always looks like that), we don't think it was fancy dress... So why does Kate resemble a 1940s showgirl on her way to the sleeping compartment on The Orient Express after a night out at The Blue Oyster Club?
It looks even barmier from the back, on account of the stilettos and the flamingo she's carting around on her shoulders.
What makes her outfit choice more puzzling to the uneducated (I'm sure it's some vintage couture piece someone famous wore once - like David Bowie during the video for Ashes to Ashes, for instance) is that she was attending the after party for A String of Naked Light Bulbs - a documentary about "the most stylish women who have visited" legendary London club Annabel's...
Maybe I just don't get it. Like, I REALLY don't get it... Surely something like what Suki Waterhouse wore would've been a lot more complimentary. Hell, she would've looked better had she come dressed like Harry Styles. Then again, if she had, perhaps she wouldn't have gotten her own article.