Check my website this is WHAT TO WEARhttps://www.keeneluxurytravel.com/expedition-cruising/what-to-wear/
Ken wears just blue jeans. I wear a thin long underwear and a light fleece pant most of the time. Sometime not the long underwear depending on the say.
I never use a walking stick most of the time you are on beaches - look at the pictures from the landings. Mostly flat beaches some areas can be rockyhttps://www.keeneluxurytravel.com/expedition-cruising/antarctica/