the style emerged in the sixties, but after all the model was the american sportsmen of the fifties. Fitted suits, perfect BD, American brogue or loafer. Clean and short haircut. Simple and at the same Time quite elitist. on the smart end, it Can not ne beaten. Then came the American astronauts who added modernism, and a closer haircut... Still today, if you maintain some elements of the look with style in mind and think about the ageing thing and avoir for example big security boots, you can look great. It is just à question of dosing the elements, and to have a certain sense of smartness.
I think the model of the 60's was the teens and early 20's.