Of all of these Citrico's is the one you're least likely to see people in park attire at. Many hold thei intimate wedding receptions there, it's a fairly upscale restaurant. While sport coats are not required, one would not be out of place wearing, and in fact they would be more the norm than shorts and t's.
DH and I dress in smart casual attire when dining at any of the placea you mention. Narcooses and the Flying Fish are probably the least dressy of them, and you'll see more in park attire in those places, although in our visits there are a higher percentage of people who change into slightly more dressy clothes (resort casual type attire) than those in park attire.
Anne