An article of clothing before washing?

We will be gone for 3 weeks and I'm just starting to pack and consider how much to bring. I hate to overpack and usually fit everything in a carry on, but not this time. This cruise will require every sort of wardrobe possibility...

Do you ever wear tops more than once?( if they aren't soiled of corse)Each night they take portraits which is always a fun reminder of the trip so I hate to repeat outfits for dinner.