The term blazer identifies two distinct jackets; the first, original blazer, was a single-breasted boat club jacket, worn for rowing, of brightly-coloured, often striped cloth, with contrasting piping; essentially an early sports jacket. The second blazer is a fitted, classically-cut, double-breasted navy blue jacket, originally called reefer jacket, now an occasional usage. As men discontinued wearing the original boat-club blazer, the term then applied solely to the double-breasted naval version dressed with metal buttons; the military originals were black.
"Look at my Blazer man"
"How fresh is that Blazer son?"
"I might just wear a Blazer and Jeans to the Party"