No Zoobas....
We dressed up (long silk dress for me - "casual" long silk dress, if you can imagine such a thing, sportcoat and tie for hubby). Our tablemates had on nice clothes, but no sportcoat for him. (She always looked spectular - one of those women who would look "put together" in the clothes she paints her living room in). I didn't pay too much attention to give an accurate count, but it didn't seem to me that our tablemate stood out without a jacket or that my husband stood out with one.
If you want to "dress up" do so, it is requested on your Navigator and mentioned in the documents, and it is a lot of fun. If you tell your server the night before that you "didn't bring a jacket, so you are just going to eat at the buffet" like our tablemate, you will be "scolded" and told to show up in whatever you have - the Tritons menu is not to be missed and they don't care if you didn't bring a jacket.
I wore a skirt both nights to AP, a dress to Tritons, and "tropical feeling" capris to Parrot Cay. We "themed" our dress for the dining room, because it was fun.