While all of the previous posters are correct, as a woman I think I know what you're getting at.
So, you are dining at 5 nice places, so bringing 5 "nicer" outfits to wear to your dinners. Perhaps one of those outfits is a knockout dress and high heels, and one of the others is a really nice pair of capris and flats....which one do you wear to which place? Here's what I do, though of course, as mentioned, all are fine at each place:
Since we always stay at the Polynesian and have a rental car, we would be driving to Jiko, so I would wear the killer dress and high heels there (less walking--you might want to think about your transportation when planning outfits). It's also probably the one with the
least casual atmosphere/theme, IMHO. As mentioned upthread, Brown Derby is in the park, so is the
most casual by definition and I wouldn't wear anything very special there--pretty much your "least" fancy outfit.
Hmmm, after that I would say that Narcoossees and Yachtsman are about the same level of outfit (for me) though Narcoossees edges up a wee bit (but then, I don't care for Yachtsman and don't go there often, could be coloring my perception) and Artist Point (while quite lovely and yummy!) is in a more casual-themed resort (and we would be taking the boat there) so I would say a middle-fancy/casual outfit for dining there.
To make it more plain, I will rank them in order of how casual/fancy I would dress for each place, with 1 being "fanciest" and 5 being most casual:
1-Jiko
2-Narcoossees
3-Artist Point
4-Yachtsman
5-Brown Derby
Hope this helps!

But remember, as everyone else said, your nicer outfits will be fine in any of them, of course. Think about transportation, and what you will be doing before and after each meal, etc and wear whatever you are comfortable in that isn't against the dress code.