What are the meanings of the"libertymen" and "bum-freezer jackets". Thank you ! context: They ride down into the city. Everywhere the rolling walk of sailors, libertymen in bum-freezer jackets, all conversation at the bellow, and on their arms scruffy whores, loud as their men. .... What are the meanings of the"libertymen" and "bum-freezer jackets". Thank you !