We did this trip in March 2022! (U will love it), Antartica we brought thermal top and bottom, track pants to wear over the thermals, fleece top to wear over thermal, neck gator, mittens, water proof pants and hat. They provided our heavy coat. We were never cold and somedays especially hiking we often had to unzip our jackets and remove mittens as we were too hot.
For the ship make it easy with khakis \ jeans and Long sleeve tops that u can alternate. We each brought only 4 tops. Only 2 couples on our cruise dressed up, everyone else was super casual.