Level of formality: High.

Definition: Black tie means a tuxedo.

The Suit: A tuxedo. Read the situation in terms of what you can get away with here. The no-fail option: A classic black peak lapel number. Shawl collars, color variations, and stylistic details can either represent a welcome swerve (like on a red carpet) or look wildly out of place (like at a very traditional wedding). And, as always, you can never go wrong with black.

The Accessories: Black tie is most commonly a tuxedo worn with a bow tie, although some will opt for a straight necktie (though we don't necessarily recommend it). Your shirt should have French cuffs, which you can wear with cufflinks, but only true sticklers will give you a hard time about a barrel cuff. Studs for your shirt, unless you go ultra-sleek and opt for a fully covered placket. You have the option of a pocket square (go with white, naturally), plus a waistcoat or cummerbund. Shoes should should be dark and polished, and worn with black dress socks.

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