Yes it can be Cold!
No you won’t get cold!
Specialist Clothing? For clothing think ski holiday with a bit of wet salt water chucked in. A ski jacket or down jacket under normal sailing waterproofs works fine in the more extreme weather in Antarctica or the Arctic. Good warm waterproof boots and maybe hiking boots once ashore.
Footwear is important.
Prepare for – Antarctica – snow, ice, rock and penguin poo. South Georgia – sand, gravel, lichens, grasses and mosses. East Greenland – tundra vegetation, cotton grass arctic flowers and fluffy arctic hares….