Originally Posted by lawyerdad
Hmm, I guess I'm a heathen on this one. One the occasions when I go "business casual" at the office with an open-necked shirt I usually wear a t-shirt (sometimes colored although usually white - but worry not, drink, always a clean newish one) underneath. To my eye, it just looks cleaner and more professional than going commando. Plus, my wife likes it, which generally is not dispositive for me but isn't completely irrelevant either. I also find it more comfortable with many shirts.
Yes, I suppose it may have an element of fussiness about it, but don't many sartorial choices? I feel reasonably comfortable that nobody who has met me would ever think to describe me as "frat-boy chic" or "provincial" (and both my wife and my secretary would roll on the floor laughing at any attempt to use the word "tidiness" in reference to me).
I rarely wear polo shirts, but can't imagine wear a t-shirt under a polo.
I hear you. I find the idea of wearing a dress shirt without an undershirt vaguely vulgar, though I usually wear vnecks. To each his own, though.