(Historical costume was popular for men as well as for women, as this stylish men's costume of a the late 18th century demonstrates.)
Coat of snuff-colored satin with lapels and cuffs of green; vest of white satin and breeches of pale blue; white silk stockings, black, low shoes with large buckles, black hat, white cravat and wrist frills.
Source: Masquerades, Tableaux and Drills. New York: The Butterick Publishing Company, 1906.
(National costume or folk dress of different countries were popular themes for fancy dress costumes. This outfit is remarkably similar to modern formal Scottish dress for men. It features loose hair and even reveals a few inches of bare leg. The "vest" referred to is a blouse or dickey, not a waistcoat; it can be seen under the jacket and plaid.)
Kilted skirt of Scotch plaid. White silk bouffant vest. Jacket of the principal clan color trimmed with black velvet, and scarf of the plaid goods. Cap of plaid.
Source: Masquerades, Tableaux and Drills. New York: The Butterick Publishing Company, 1906.
(Fancy dress balls for children were very popular, and the patriotic early twentieth-century mother could dress her son in the style of Teddy Roosevelt's unit from the Spanish-American War.)
Costume of khaki cloth, duck or canvas, with leggings to match. The trimmings may be of red, blue or yellow, with brass buttons. Tan felt hat with crossed sabres.
(This is a great costume typical of many of the more abstract fancy dress themes. It's taken from an Edwardian era manual but has draping at the hips much like that of the bustle era, though with hints of the Edwardian silhouette in the corsetry. Click the illustration to enlarge for the details.)
Skirt and bodice of cerise satin. Draperies of pale-gray gauze, with laurel leaves, etc. for ornamentation. Staff and notes painted on the skirt.
Source: Masquerades, Tableaux and Drills. New York: The Butterick Publishing Company, 1906.