How many men's formal attire shall be subject to rules that are accessory to the few available means for personal expression. Always keep in mind that you are trying to accessorize your tuxedo, not overpower it.
You buy a dress set for your man suit. These should be at least two studs, two cuffs, and at least three vest buttons.
Decide on a fly in a fabric that goes along with your dinner jacket trim. If the jacket is trimmed in satin, it is best to go with a satin bow, so that the texture can not compete. Ribbed trims and fabrics can be good with grosgrain.
If you are a fly in a different color than black prefer to wear, try it with your handkerchief and cummerbund to coordinate colors.
Show neatly folded handkerchief in your breast pocket on the front.
Braces or suspenders with braces wearing register directly above the first crease of the trousers.
Get tuxedo slippers, comfortable and stylish. Remember that socks are a good place to show some unexpected color or pattern are.
Keep to tame it. If you want to add a touch of the unexpected and daring to your ensemble, try to limit only one element. If you have more than try, you risk going overboard.