In the first place, people who choose to wear in steampunk style will not use it to formal events. Such kind of clothes could only be wore for some informal parties. So it is not inappropriate if it is in an over tone or exaggerated way.
No matter you are a man or a women, it is a good choice to choose the clothes in the brown color. Steampunk originally appeared in the period when the machines were highly developed. And the clothes and the accessories are better in the brown color or have the copper detail. Not all the clothes in the steampunk style are in the brown color. If you just start to get into this style, the brown one is better.