When Undressed Is Well Dressed

When I consider what appropriate attire is I usually think of business casual. A Polo shirt or button down shirt with a pair of khaki pants. In Western culture that is what's considered average attire for work on Friday. But, what is considered average or normal attire for a nudist resort? If you are wearing little more than a pair of cowboy boots with a 10 gallon hat on, would you be overdressed? I suppose it depends on where you are. Which begs the question; when is undressed well dressed?