Don't turn up nude: The rules are not that difficult: keep things elegant and classic; don't lay an egg à la Björk; don't wear a back-to-front tuxedo à la Celine Dion; and don't indulge in a trend. And if ever there were two trends to avoid, they're flowers and nude colours. I'm usually a fan of Michelle Williams's dress sense, but here oversized daisies have blooming taken over, even the straps. Second, that putty colour is all wrong, as the fabric blends into her skin. Think how lovely she would have looked in a rich jewel colour to bring out her eyes, or even in a more subtle floral print.