What look are you after? Who will you be with? OH/new BF/Friends/work peeps?
I'd probably go for black cigarette trousers and a navy satin oversized shirt I got from H&M last year with very high black stilettos if it's girls/work but if i wanted to look sexy it would be a racer back below the knee length black jersey dress from Miss Selfridge and black bondage sandals with silver metalwork on.
I'm thinking skinny jeans, black vest, white tie front blouse with black spots, red heels and lipstick... I was going to wear a dress, but it looks chilly, and I'm going with people who are usually quite casual.<sigh> normally I wouldn't worry so much, but I'm having an ugly day today.