My Halloween costume a few years ago. This is one of the most well liked out-on-the-town Cosplays I've ever done (even if people complained my hair was more dark ginger than brunette).
It's a basic strappy top and shorts, then I spray painted a toy gun shiny black, and made a gun holster out of lengths of ribbon. Add some cut off gloves and sunglasses (which made it had to walk around the club!) and enjoy the attention.