What to wear? Crown S.America

[vickam]

We are booked on Crown on March 25th sailing South America cruise. I know that the weather will start off warm and be cold for the majority of the ports. However, can anyone advise what the onboard temperatures be like. I am coming from South Africa and therefore do not want to pack a lot of unneccessary luggage. Any advice on what type of clothes to pack will be appreciated. Also, I know one cannot bring alcohol on board but what are the rules for non-alcoholic drinks? If we buy these in ports are we allowed to bring back on board for consuption in the cabin? Any tips for this cruise will be appreciated.

[CruisinMK]

I brought a good hooded windbreaker, with gloves/hat/sweater in a small backpack just in case. Vast majority of the time I didn't any of it, not even in ushuaia.