Wear warm layers under a windproof top. Don't wear goose down, if its wet its useless, if you fall overboard it will kill you. Skip the ski pants but wear thermal underwear top and bottom. Wear something that can zip high up your neck but don't wear a scarf. You will need shoes that have a REAL deck shoe sole. I know normal deck shoes may not be warm enough and you may have to go to some kind of boot but its important that they be designed to maintain grip on a boat deck. Don't wear them outside to break them in if you can avoid it, its not good to have tiny rocks and debris caught in the tight tread of a boat shoe because it scratches the deck and limits your grip.