You'll see people dressed in shorts and polos as well as in upscale resort wear (tommy bahama, etc.). While my hubby is a jeans and polo dude....I always ask him to wear khaki's and a polo and jacket at the CG....it just fits better! In the end, if he is comfortable that's what counts! As long as he isn't scruffy, etc. he'll fit in. I'd rather see a guy in shorts and a polo than a six year old in resort wear acting up!!!