Well-dressed men seem to differ on this. I think Flusser forbids it. I understand the reasoning I've heard used against it -- the sharpness of the peaks is a definite contrast with the roll of the collar. I just don't think I agree. It seems to me that they click together. I'm interested in hearing your thoughts, though.
Let's take it as a given that I'm talking about a relatively dressed-down DB suit look -- say, a a flannel DB, madder tie, and perhaps a pinpoint shirt. I can't conceive of that as incoherent in terms of formality. My inclination is to look at a DB suit as, if anything, a little less formal than an SB suit.
Do you reckon the cut of the DB (button stance and arrangement, gorge height, lapel width) has any bearing on this?
Hopefully doesn't mind that I'm stealing one of his pictures, but I think he does this very well.
Fred can't object, of course.