From Longman Dictionary of Contemporary Englishsingle-breastedˌsingle-ˈbreasted adjective DCa single-breasted jacket or suit has only one set of buttons down the front → double-breasted
Examples from the Corpus
single-breasted• A double-breasted jacket needs no waistcoat, but one is quite acceptable with single-breasted.• The jacket was very fitted and single-breasted, cutting in sharp at the waist - which made the trousers balloon right out.• Opposite page: grey single-breasted pure New Wool suit, £225, from Blazer.• Opposite page: grey single-breasted pure New Wool suit, approx £450, by Hugo Boss.• There's one single-breasted raincoat which has been in every collection for almost 20 seasons.• Evening jackets should be double-breasted or single-breasted, with the appropriate conventional revers or lapels.• Left Navy single-breasted wool suit, £295, Aquascutum.• Right Navy single-breasted wool suit, £500, Paul Smith. 