There's an article in the Fail about Edo, how he had a last minute invitation to Sandringham which caused a panic as he had to bring so many outfit changes for the festivities, and how it can be a real headache for the female guests.
I'm tempted to do an imaginary shopping spree putting together my last minute outfits from Net a Porter and Matches! I think I might go with dark green, like Kate's hat and Charlotte's coat for my walk to church outfit, maybe with navy accessories, I'd definitely go with boots though. I know it's heresy on this thread but Im considering an Erdem dress for the Christmas Eve dinner!