While you could certainly get away with a pair of highly polished cap-toes at most black tie events, I wouldn't recommend it. Â Patent is the only appropriate way to go. Â Personally, I find slip-ons affected, so I choose to wear patent shoes with laces. Â I would also recommend investing in a solid pair, as nothing is more irksome than a pair of cheap shoes. Â I wear this particular pair from Allen Edmonds: AE Spencer
But I prefer this pair from C&J: C&J Chatham
Best of luck to you.
Ah the old debate between highly-polished calf and patent leather. Â I don't which side to favor. But I like this calf grenson formal pump, 4th down on left: http://www.benniesshoes.com/grenson10.htm
And this is the patent version, 2nd down, 2nd from left: http://www.benniesshoes.com/grenson10.5.htm
Edit: see that you gents have already posted Grensons. Like Z., I've found them a bit tight across the toe. And when I went up a half-size, they became to long, and still a bit tight. I don't think I have freakishly abnormally sized feet either, so I don't get it.