Betty, I have been reading up on Cruise Critic. The folks there indicate that you need to go up a size or two. Ngaire emailed me tonight a link to her wonderful website full of great info, so do read her website if you haven't already.

http://www.bksilversea.com/2012_Prince_Albert_Antarctica.htm

Also, look at CC links under Silversea Explorer. There were some interesting tidbits... some folks recommended ski googles if you wear contact lens; they recommended collapsible ski poles to help you walk or walking sticks, face masks, ear warmers or headbands, neck gaitors and two pairs of socks and long underwear in case you get a pair wet and go out on am and pm zodiacs. Ngaire has a bunch of other useful tips. Doug and I liked the gloves for photographers that Ship to Shore sells.