OK, I'll bite: Costume meme

Stolen from the originator, sarah_bellem:

Costumers all tend to have a specific era or genre that appeals to us aesthetically, which is fine, but sometimes we get too focused and fail to appreciate other eras or genres that might suit our body type, our facial features, or even just challenge us to think outside the box a little bit. So, I'm opening the floor for suggestions: Give me one costume you'd want me to wear, and why. Picture links appreciated. :)

And then spread this meme like SARS and I'll try to do the same for you!