|Can be Dyed?||Yes|
Description (From Recipaedia)
Long Johns made of canvas. Can be dyed. No protection. Good insulation.
From wikipaedia: "Long underwear, also called long johns or thermal underwear, is a style of two-piece underwear with long legs and long sleeves that is normally worn during cold weather. It is commonly worn by people under their clothes in cold countries."
They are used in place of boxers, in the game. They are needed to get the maximum insulation rating, so you are less likely to freeze in cold climates.