Another way is by your skin color, there are four types of complexions, Winter Spring, Summer, Autumn. By knowing your complexion you know what colors look good on you, because certain complexions look better with certain colors. With that you are able to dress yourself in the most flattering colors. (http://www.ehow.com/how_3249_choose-colors-flatter.html)
There are a few websites that you can find out where to find the new upcoming color style, and find your new skin complexions. To find the new colors for the upcoming year you can go to:http://www.decoratorsecrets.com/color-trends.html.
You can find out your skin complexion at http://www.ehow.com/video_4973206_choose-colors-flatter-skin-tone.html.