shorts, t-shirts, tank tops, bathingsuits and cover-ups are all you will need for daytime wear.
Nice pants are fine for casual dinners
Pack a lightweight sweater to throw over your shoulders at dinner or out on deck at night it can get chilly
If your formal wear gown is sleeveless or strapless pack a wrap or shawl
Men sould pack a lighweight jacket in case the evenings on deck get cool.
If home is chilly when you leave, wear comfortable pantsand shirt and a zip-front sweatshirt or fleece jacket for traveling. That way you will have it with you if you need it and you will have it for when you get home
The cruiser above is correct. Tropical casual wear for daytime and typical Caribbean dress wear for evening is fine. You can even pack a "winter fabric" formal gown or dress, if you like. Don't forget a light jacket and umbrella just in case of a rain shower. You are still at the end of the Hurricane season.