If we could wear shorts to the office, we might. But a safer, more stylish career move is the lightweight suit—specifically the cotton suit, which was welcomed by grateful men in the 1930s, before central air. Light and comfortable in both fabric and fit, the cotton suit is a cool choice for the workplace and weekend alike. At the office, wear a jacket that has a bit of structure so it can keep its shape all day. For one of summer's signature social occasions, opt for soft shoulders with minimal lining. You'll look smarter and breathe easier. No sweat.

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