Adjective
Lapping over the breast only far enough to permit of buttoning, and having buttons on one edge only; as, a single-breasted coast.
Source: Webster's dictionarya single-breasted jacket Source: Internet
Although some style authorities consider the wing collar to be an acceptable option for black tie shirts, they should not be worn with double cuffs or a pleated bib, citation and are better suited to the more formal single-breasted peak lapel jacket. Source: Internet
The winter service dress uniform, of olive drab wool, consisted of a single-breasted coat having patch pockets with flaps, a khaki shirt and tie, and trousers that were usually cuffless. Source: Internet
Some higher-end single-breasted jackets, both new and vintage, tend to be fastened with a link front closure which is visually similar to a cufflink ; this method of closure is still common in the United Kingdom. Source: Internet
The original and most formal model of dinner jacket is the single-breasted model. Source: Internet