I like the lines of a 1903 Colt, but I don't want .32ACP. It would look awfully nice in the cummerbund, though. Have it engraved in an art-deco style to go with the lines of a tuxedo.
In a more reassuring caliber, I'd like a highly polished, lightly engraved Webley R.I.C., with mammoth/mastodon ivory stocks, and shirt studs to match. I'd probably want a Wilderness belt under the cummerbund (strong side carry). If Ronald Reagan could put up with wearing patent-leather opera pumps with a tuxedo, I guess I can do the same, and have a patent-leather Tom Threepersons rig made for the Webley.