How to wear a suit in summer, and why it pays to take tips from the style icons of old Prince Charles, Joe Biden and Gregory Peck have all shown how a tailored suit can be worn well in the heat Prince Charles in lightweight suiting, with Princess Diana during a 1983 tour of Australia Credit: Getty Time was when smart dressing for summer was never much of a thing. White chinos, a blue-chip (horn-buttoned) blazer and the palest blue shirt undone to the breastbone; until the advent of ‘Riviera chic’ and the subsequent upsurge in sports-casual, few men doubted their inner fortitude when it came to beating the heat.