(click to enlarge)
Source:
Lakeland (Florida) Ledger - 4/9/61
Historical Perspectives of a 'natural shoulder' Style




"When I was coming of age in the mid-1960s there were two schools (at school) of dressing: the collegiate kids and the rats. The rats wore little Beatle boots and pointed shoes and tight pants. We weren't The Lords of Flatbush, but in seventh and eighth grade we thought we were pretty tough, so we slicked our hair back and wore black. The collegiates were wholesome, very Kingtson Trio, very Harvard Square - madras jackets, cuffed khakis, navy chinos, blue button-downs, yellow barracuda jackets, and Weejun penny loafers with barrels on the sides.
"(Ralph) and Joe Barrato, his friend from Brooks Brothers, had been lunching out regularly ever since Barrato got out of the army and joined Corbin, a trouser company, in 1963. In the mid-sixties, the well-dressed Traditional customer wore Rivetz ties, Corbin pants, Southwick natural-shoulder jackets, Gant shirts, a Canterbury belt, and Bass Weejuns. Ralph told Joe he wanted to bring them all together - in slightly more sophisticated versions - under the Polo banner. But Ralph also wanted the Brooks customer at every age - prep schooler, Ivy Leaguer, privileged adult. And then he wanted to go beyond that, and reach out to the likes of Ralph Lifshitz and Joe Barrato, and give them the tools to turn their insecurity into aspiration and motivation. "I design for my world, for the people I know, whose lives I understand," Ralph would say. "Someone like me." His pitch hit a chord."

...The 1950s are best remembered for the “gray flannel suit” worn by the conservative businessman. Now men were back to the natural-shoulder silhouette. As reported in Apparel Arts ‘75 Years of Fashion, “No style was ever so firmly resisted, so acrimoniously debated - or more enthusiastically received in various segments of the industry. Natural shoulder styling eventually became the major style influence. Brooks Bros., once a ‘citadel of conservatism,’ became a font of fashion as the new ‘Ivy Cult’ sought style direction. Charcoal and olive were the colors.” 
"Even in the 'natural shoulder' realm, insurrection was becoming orthodoxy and the establishment was on the run: