This is a question I had as well. What I have found out is that we will need our winter stuff until we get out in the gulf, and then it will start getting warmer. By the time we get to Cosumel, it will be warm enough to swim. I was told that on one cruise, they came back to snow on the ground in Galveston. I guess we will have to see how bad the winter is here, but we have talked about leaving all the heavy stuff in the car, in Galveston, and change back into it once we get back.
I hope that others will tell us there experience.
What ship are you going on, and when in Dec.