What port are you sailing from? When we have sailed in the winter months, it is usually cold the first day/night and the last night. On all the Carnival ships I have been on, it is cooler in the MDA and the theatre as well. I always take a jacket or sweater of some sort and my DH usually takes a light jacket or windbreaker for those times. The first time we sailed in the winter, I was so glad that we brought our black jeans and sweaters for the last night.
Been there - done that:
2005 Holiday, Sensation, Conquest,
2006 Conquest, Celebration, Holiday,
2007 Freedom Grand Med, Holiday
2008 Fantasy & Sensation,
2009 Fantasy, Holiday & Dream Grand Med
2010 Fantasy and B2B Elation
2011 Monarch of the Seas
2012 Booked - Breeze from Barcelona 12 days
Henry, as a woman i usually pack a light sweater, wrap or shawl just to have something to throw over my shoulders because the ac in the dining rooms and theatres is usually cranked and my attire is for summer, and mostly sleeveless, if i did wear a sweater it would be a light/summer weight sweater and i would wear it as my top not over anything else.
As you know, we just returned from the Zuiderdam cruise of 11/3-11/13. I usually am not bothered by too cool temps in the various public rooms, however, there were a couple of times that I wished I'd had a blanket, especially in the theatre. Some people had towels draped over themselves it was so cold. So, bring a sweater or sport jacket.
I'll bet those folks on the Carnival Splendor would have loved the cool temps. !