A portion of Americans lead a very public lifestyle. The CEO of BigDeal Inc is in the public eye. While you or I might not know him people in the business world do. In a sense he is never 'off duty'. Your cohort is Brit subdued stripes 3piece your dress down is Blazer colormatch pants tie. Your casual becomes Blazer open color contrastpants.
Golf casual is about as down as you get because the 'Right' club requires jackets for men in the barroom.
The older you get the more of a chance you travel in those circles.
Those who dress in such social uniforms do so as second nature.. it's what they do.
Just like a lot of you get up go out and do a run... it's what you do.