(A). A frizzled wig. Doctor Busby, master of Westminster school, did not wear a frizzled wig, but a close cap, somewhat like a Welsh wig. (See Wigs.)
The tall cap of a hussar, artillery-man, etc., which hangs from the top over the right shoulder.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Busby from Infoplease: