Sentence:  The headdress was a fur busby for the 1st-4th Regts., and a felt <WSD>mirliton</WSD> or "Flügelmütze" for the remainder (also worn by the 4th, 1752-71). 
Meaning of the word marked with <WSD> tags:  An 18th-century hussar hat resembling a slightly conical shako or tall fez.