Light cotton is not bad. I have 2 nice cotton shirts rolled up navy style for going out. I take 3 pair of light shorts, a fresh 5 pack of cotton tees and underwear from wally mart and on pair of clean chinos. A pair of sweats and a chasmere (Yes) sweater (It dries fast and is warm.) is all I need for 6 months. I leave it all in the boat for the next season in the big zip bags. You/we are all going to buy a formal tee shirt from some bar.
Just remember to change your oil naked so you do not get it all over your "Good" duds.
Will, Muffin, Lucy the dog