There are really two questions here:
1. Do you want to express who you really are?
2. Or do you want to pass?
Both of these questions are honest. I dress to express who I really am. I can pass (although I have actually been mistaken for a WNBA player) although, to be truthful, I am amazed (or maybe people are just being polite).
I think that the most important thing is to present yourself with confidence and poise. Those giggling girls that Laura mentioned were too stupid to realize what a great compliment that Laura was giving them by the way that she presented herself to the world. They would probably also giggle at somebody wearing "last year's" lipstick color.
Hang in there, ladies,