Posh private party coming up, described as "Arabian Nights" but with no specific dress code. Any suggestions for a subtle touch which will pay lip service to the theme without making me feel a complete prat? I'm not at all a dressy person - understated elegance is what I'm aiming for here (little black dress, if I can still get into it). The other guests are my neighbours who normally only see me in leggings and wellies. Many thanks in advance for any inspiration!