I bought a new dress for this occasion, it's very rare that I would wear the same outfit for a night out twice. I chose a black dress from Miss Selfridge and accessorized with a clutch and heels. In my opinion you can't wrong with a black dress.
It's a black denim dress which flares at the bottom, with a faux leather band around the waist and also across the chest which wraps around the neck. For a better idea you can check it out here.
I paired this with my New Look stud blazer
For shoes and bag, I wore my staple Red or Dead black stilettos which have a suede effect and get dirty very easily. They are also murder on my feet but vanity wins over comfort! The clutch bag is a cheap one from New Look. I love this style of bag. You have two options, it can be worn in hand or under the arm and it was only £8 :)