I think that generally one should wear the shirt collar inside the sweater, although I have had quite a few friends who wore the unbuttoned collars of their button-downs flying outside their crewnecks ...

[1] At work: Take a break from your standard navy blazer and sub in a fitted cardigan over a shirt and tie. Gray or navy is your best bet, especially when you avoid bold patterns. Cotton cardigan ...

There’s no rule. And with deregulation of just about everything proceeding apace, I don’t see one looming. I think this decision depends on the size of the collar and one’s personal taste. When I wear ...