'A short, double-breasted jacket called the reefer jacket was worn by sailors in harsh weather in the 1800’s, when they performed duties such as reefing the sails. The modern dark—single, as well as, double-breasted-- blazer with metallic buttons is said to have evolved from this. Many fail to tell the difference between a blazer and a sport-jacket and put themselves in a precarious position of committing a fashion faux-pas....