Know Your Colors
The first lady knows what colors work for her, and she uses them to her advantage. Blue is her signature hue, and the various shades she has worn through the years have always brought high marks to her fashion grade. She often dons blue during significant public appearances, such as a state dinner with the British Prime Minister and his wife, as well as her first appearance on "The Late Show with David Letterman." Considering blue is a color that evokes a feeling of calm and relaxation, she has the right tone for the job.