I just want to know if I would "stand out" wearing an overcoat with a contrasting collar.
I can't comment on whether you'd stand out in the USA, so I'll defer to STYLESTUDENT. In The Netherlands, where I live, you also won't see an overcoat with contrasting collar that often. They are there, but few and far between. I've seen one of our royals in one and saw another such coat (with a plum coloured collar) in this newspaper photograph:
. I have one myself, and that's about it. Then again, in London, where I was the week before Easter, I almost seemed to run into such coats at every streetcorner when I walked around St James'. Perhaps this goes to prove it indeed is less of an universal look. On the other hand, a covert coat usually is quite a bit lighter coloured than your usual and or average overcoat, so by wearing that coat you'll probably stand out anyway. I presume the predominant shade of (long) overcoats in the USA is dark (blue, grey or black). I also would let the colour of your coat rather than your collar be the determining factor in pairing it with a suit. So the question for me would be whether you would wear a light brown/tan(?) coat with a black suit. Would you wear a camel coat with a black suit? FWIW, I would be hesitant to wear my covert coat over a dinner jacket (tuxedo). Hope I've helped. MtB As an aside, the newspaper article
I saw the photo with the plum collar in, was about a walk through the centre of The Hague -where I live- and focused on the Jugendstil
architecture of the city centre. The site is in Dutch though... but there are several pictures in it of Jugendstil
architectural design elements.