We leave in three weeks for Le Boreal for the Antarctica. I have a question for Mike 2131 or editor@cruisecritic. The info I have says there will be two formal dinners. How formal are these on this type of trip?There is NO need to bring dress up clothes on an expedition cruise. You will probably see anything from the odd suit and cocktail dress to pants, a flannel shirt, and suspenders to pants suits. The one safe observation is that usually no one will be in jeans (no matter how nice) at dinner - but I did see that once. The default? I wore a button up dress shirt (no tie) and a sport coat with a nice pair of pants. My girlfriend wore a nice skirt and top. We were comfortable and enjoyed the "formal nights" much more than we would have dressed to the nines.
Based on our Arctic and Antarctic cruises, my take is that the Europeans tend to dress more formally and the Americans dress somewhat more country club casual. Our experience is that no one really cares how you dress on an expedition cruise. The reason everyone came (wildlife, scenery, history, etc.) is the bond that makes the trip special.