Summer is always associated with more sunlight. Sunlight positively affects women's hormones and makes it easier to get enough fresh air and exercise. Cheerful lemon yellows or bright, happy pinks naturally reflect the mood of the season.
Light wardrobe colors have a ripple effect, too. You wear them because they reflect your mood and make you feel good. Designers know this and feel the same way. That's why you'll always see light colors on the new racks come sunshine time. Look for bright coral, daffodil yellow, gentle violets that blend into pale stone colors and ultra-light greens. Wear these colors head-to-toe for a sophisticated monochromatic style -- or accent the bolder tones with low-lights of the paler ones to be totally contemporary.
Science has proven that dark colors are going to toast you, so light colored outfits also draw summer support just because they can beat the heat. White is your best bet. That's because light, which generates heat, is an electromagnetic wave. Unlike sound, light can travel through the color spectrum. It travels slowly through darker colors, which keeps it near your body for a longer time. So, while all black is a guaranteed sweat-fest, petal pink, stone blue and morning-inspired yellows keep you cooler by reflecting light.
If you absolutely cannot give up your dark colors, there are still a few solutions. Black does indeed go with everything, so toss in accents, like heavy bangle bracelets or wide belts. You can also try sheer fabrics, like lace or tulle overlays. Navy keeps things on the dark side, but conjures seafaring and picnics and other summery endeavors. Pair it with a light ecru or white so you don't overheat.