Like the fellow mentioned above, wearing a suit to a black tie (read tuxedo) affair is cause for revocation of the gentleman card. A metaphor I used with my young sons years back to teach them the fine art of behaving properly with women.
To retain ones card, only a real tux will do. And with that tux, any item of mass and weight in a pocket will distort the shape and fit of the garment and you're within a hairsbreadth of losing ones card.
The only technique is a tight-fitting shoulder holster with a modest sized gun (a plausible reason why James carried a small caliber weapon) and/or an ankle holster with another modest sized semi.
No gun in pockets or in cumber bun. And while we're at it, no baseball caps turned backwards. Nothing.
B