We are on the same cruise. When I take Canada/NE cruises I dress during the day the way I would at home for that time of year. As for sleeveless dresses at night, I would definitely take a wrap or sweater. They don't keep the ship cold, but they don't keep it toasty either.
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Serenade OTS Mediterranean Cruise October 2013 Review with Pictures http://boards.cruisecritic.com/showthread.php?t=2141573