fearnaught

Etymology

fear + naught

noun

1. A fearless person.
2. A stout woolen cloth of great thickness; dreadnought
   [T]he crew however stand it tolerable well, each being cloathed with a Fearnought jacket, a pair of trowsers of the same and a large cap made of canvas & baize, these together with an additional glass of brandy every morning enables them to bear the cold without flinshing. 1772, James Cook, The Journals, Second Voyage, 4 January
3. (by extension) A warm garment, especially one made of this cloth.