I "crossed" last March/April from Ft. Laud. to Madiera Island. I didn't know what to pack either! Our crossing was 12 days (Seabourn Pride) and the weather was beautiful! Only one morning did it rain......then about noon, the sun shone! We were comfortable in shorts, pants, and I took cute long cotton dress's for daytime......then we dressed every evening. But, I would take a "wind-suit".....and a sweater or two. In the Caribbean it will be very warm.......so summer things. You will LOVE the crossing!! We cruise Seabourn twice a year....last March was our 1st "crossing"......but NOT the last! You will make lifelong friendships! It is so much fun!!
Happy Cruisin'!! and Happy Crossin'!