Five: Shirts

As for shirts, three or four will do. One light, long sleeve, one short sleeve, one nice polo and maybe one long sleeve button up. I recommend merino wool. They're expensive, but you can wear them over and over again before you need to wash them. And they're way more comfortable than cotton. The idea of travel and vacation is to relax and experience. It doesn't take much more than a good personality to impress the new people that you meet.