Instead of falling in a pattern of too-casual workwear, Adam says you can't go wrong with black—even in summer. "Black is a universal, multiseason color," he says. "In warmer months it just needs to feel lighter."
• Pick airy, diaphanous fabrics—voile, eyelet lace, chiffon.
• Avoid high collars and long sleeves or you'll look like a Sicilian widow. Better: a breezy shift dress.
• Relax with accessories in natural textures like raffia, wood, and leather.
• Try a graphic combination of black and white or khaki.