It all sounds a wee bit fabulous (See: Socialite Socialite Tamsin Lonsdale's Supper Club Probably Doesn't Want You and Supper Club Style) so I can't just show up in any old frock.
I have a lovely Diane von Furstenberg dress that I recently bought for a wedding, but it's not very holiday-ish. I'm not saying I need to sparkle, but... well, maybe I do.
Hmmm... decisions, decisions.
I'm going to venture out tomorrow and see what I can find. I'll keep you posted on my progress.