Busby

Chambers's Encyclopaedia, Volume 2: Beaugency to Cataract, p. 578

Busby, a military head-dress worn by hussars, and, in the British army, by horse artillerymen also. It consists of a fur hat with a short bag hanging down from the top on its right side, of the same colour as the facings of the regiment, and an upright plume in front. The origin of the name is obscure, but seems to be Hungarian, and it is said that the bag is a remnant of an ancient Hungarian long padded bag hanging down over the right shoulder to ward off sword-cuts.

Source scan(s): p. 0591