:: Choose to wear the colours you gravitate towards when you are feeling a bit down.Those are the colours that generally lift your face, unless you are depressive and you just wear black.
:: Always wear colour with colour. Don't wear bright pink or turquoise with black. It cheapens the colour. If your main colour is plum, then you can wear red, pink, or orange with it. They all look wonderful and you will look taller, skinnier and far more stylish.
18 months ago I had a colour analysis done by an image consultant, to determine my season palette - I came out an Autumn. It's a great technique for finding colours that sit well with each other, rather than clashing. BUT the main bonus was it's effect on my confidence levels - knowing I'm wearing clothes that suit & compliment my eye/skin/hair colour - I feel truly ALIVE!