You'll probably need one good medium weight winter coat for the few real cold, windy days and a bunch of lighter sweaters, shirts, vests to "layer" up or down as the day progresses on the more moderate days. Also you might want to consider a shorty wet suit or "wet vest" if you plan to swim or participate in water sports during the winter months. The pools are heated (more or less) but wet skin exposed to 60 or 55 degree weather gets a bit chilly!
