While every occasion differs, less is always more when out at sea. Regarding a generalized yacht dress code, women usually choose knee-length summer dresses or loose shirts and sandals. Instead of a heavy suit, men should select linen or cotton chino shorts and shirts. Long-sleeved shirts can be rolled up during the day and unrolled as the night progresses.  It’s best to check with your host or yacht provider if there are rules about what can be worn.