When I dress, I try not to dress in one specific style. If you wear items of all one style, the outfit can tend to look "costumey." However, if your objective is simply that, then, by all means, wear all one style. My outfit, for example, was completely girly with the different variations of pink and the cat hat, so I added the biker boots and the motorcycle vest. I now look like I can beat you up and/or hug you.