Also, if you're really feeling poorly, lying down helps almost immediately. Plan some activities, like listening to music, that you can do lying down and that don't require close attention, like reading, which can make you feel worse. Just try to travel light each day, so you don't have things to hold in your hand or things hanging around your neck. You won't need all of that clothing, especially since December is summer in the Antarctic. The key is layers that you can pile on or take off when you warm up.
Fleece is great for that, because it's lighterweight than wool.
Your essential outer layer ought to be waterproof, windproof fabric, like Gore Tex. Get some good Wellington boots too. And sometimes you'll get splashed with spray on the zodiac, so make sure you bring waterproof outer gloves, and spare inner gloves. That's a very good question. It has been a great experience for me to be in the actual places.