Mackinaws refer to heavy, woolen jackets that are commonly worn in cold weather. These jackets are known as a variety of names in different parts of the world. Some common synonyms for Mackinaws are "lumberjack jackets" and "woolen overcoats." In parts of Canada, they are called "Barn Coats" or "Hudson Bay Coats." Other synonyms for Mackinaws include "checked jackets," "plaid coats,", and simply "woolen jackets." They are popular among outdoor enthusiasts and hunters alike because of their durability and warmth. Whether you call them Mackinaws or any of their other synonyms, these jackets will keep you warm during the colder months.