Ahoy Ali!
How exciting that your cruise is so close! You are getting all of my favorite things on your Disney Wonder cruise in February; Grand Cayman and Castaway Cay are my family's two favorite ports.
Since your cruise will have two sea days, those will probably be optional formal and semi-formal nights. A lot of your fellow cruisers will take that as needing to wear ball gowns and tuxedos, which is what my husband and I bring to wear on those nights. But, you will also see everything from men in polo shirts to women in capri pants and everything in between.
Disney Cruise Line's official definition for
cruise casual is "no swimwear or tank tops". I would say that mostly everyone is dressed like they are going out for a nice dinner.
Don't forget about Pirate Night as well, it is a blast to see everyone dressed in their pirate attire!
Have a WONDERful cruise. If you have other questions, please ask away.
Happy Cruising, Tracy V.