Stereotypically, overcoats used by the army tended to be single-breasted, while navies often used double-breasted overcoats.
en.wikipedia.org This is the standard on single-breasted suits, and is used on nearly all suit jackets, blazers, and sports jackets.
en.wikipedia.org By the 1780s dress was established as dark cloth or velvet, embroidered in silk or metal, single-breasted silk waistcoat (usually white), with the fronts curved away.
en.wikipedia.org By 1985-1986, three-piece suits were on the way out and making way for cut double-breasted suits and two piece single-breasted.
en.wikipedia.org For men, bell-bottoms, colorful shirts with pointed collars single-breasted jackets with wide lapels, and traditional hats.
en.wikipedia.org