Don't worry, I never know what to wear to these kinds of things either.
The theme is an English garden party, with tea and cake, so wear something that reminds you of spring, an Easter dress perhaps. White might not be a good idea.:)
Guys, slacks and a dress shirt will work, and if you're in a pastel shade you might just get bonus points from me. :) I'm sure you'll all do a great job and look fantastic.
It's getting close! I can't wait!
