Mackinaw blanket

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A thick woolen blanket in solid colors or stripes, formerly used in northern and western North America by traders, trappers, and Native Americans.

from The Century Dictionary.

• noun A name given to the blankets distributed to the Indians of the Northwest by the United States government.

from the GNU version of the Collaborative International Dictionary of English.

• A thick blanket formerly in common use in the western part of the United States.
• a heavy woolen cloth heavily napped and felted, often with a plaid design.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a thick plaid blanket formerly used in the northwestern United States