bus·by (bŭz'bē) n.
pl.bus·bies A full-dress fur hat of varying shape, worn by hussars in the 19th century and by the foot guard regiments of the British army.
"fur hat worn by hussars on parade," 1807, earlier "a kind of bushy, tall wig" (1764), of unknown origin, though it is both a place name and a surname in England.