(An eighteenth-century military costume for a boy, though there's no particular reason an adult couldn't wear something similar. Click the image to enlarge)
(1760) High white gaiters buttoned to the knee; blue coat turned back with red; red cuffs; white waistcoat and breeches; red and white pointed cap; sword; hair in pigtail.
Source: Holt, Ardern. Fancy Dresses Described, 5th Edition. London: Debenham & Freebody, 1887.