It used to be dress for success which led to casual Fridays then it led to casual everyday.
Corporate mug shots always included a dress shirt, a tie and a suit jacket. Which then led to lose the tie and an open collar shirt and a jacket.
A dark blue suit was the status quo until Obama wore a tan suit at a summer presser and everyone pitched a fit.
Now the dark blue suit has become passe and they have all shades of blue which I find revolting. Along with the dress shoes with white trim that look like sneakers. No they are sneakers.