One of my cruise friends does it too. She takes two pair of pants, tank top/camisoles, two jackets/cardigans - all mix and match - and a bunch of scarves and costume jewelery. She uses hotel toiletries and a very minimum of makeup.
One man (single) wore the same pair of cargo pants for our entire Italy trip (yuck)without washing them. They were so filthy by the end of the tour. He had one duffle bag with him and he had maybe two shirts. He did not go to dinner with us when a coat was required.
