Think of the way you look as your "packaging." What does your package say about you? Your look can help brand you in a good and memorable way OR can be a distraction from the reputation you want. You may get you labeled with a reputation you never dreamed of or wanted.
Just like your credit report, your reputation is a numbers game. You can not please all of the people all of the time, but if you can favorably impress the majority of those you meet, your credit will be good "in all the places you want to be most."