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The invitations start arriving around now. A benefit evening in November, a holiday reception the first week of December, a fortieth birthday at a restaurant on Laurier where the lighting is better than the parking. Somewhere on the card sit two words that explain nothing: cocktail attire. In our fitting room on Decarie Boulevard, we have noticed that men almost never ask what cocktail attire for men actually means. They ask about a jacket, then work their way sideways to the real question. Here is the straight answer, before the season gets busy.

What cocktail attire for men means now

Cocktail sits between black tie and what you wore to work, and it leans toward the first. The instruction is not about a specific garment. It is about intent. The host is asking you to dress for the evening on purpose — darker cloth, a finished silhouette, clothes chosen for a room lit from table height rather than from fluorescent panels overhead.

Two things it is not. It is not a tuxedo; that is black tie, and arriving in one when nobody else did is its own small drama. And it is not the suit you have been sitting in since eight in the morning, worn into the evening on momentum. The difference between a suit worn to a party and a suit worn at the end of a workday is visible from across the room, and it is mostly collar, press, and the decision to change the shirt.

The night the black suit earns its keep

Last week in these pages we said charcoal first, blue second, and black held for evening. This is the evening. A black suit at a daytime meeting looks like a misunderstanding; at eight o'clock, in low light, with a glass in your hand, it looks like the reason the dress code exists. The Jack Victor black Esprit suit — wool with a little stretch, cut in Montreal, $1,248 — is the version we would hand you: soft black with a subtle weave, so it has depth under candlelight instead of the flat, inky look of cheap black cloth.

Wear it with a crisp white shirt, collar open, no tie. That combination is the most reliable cocktail answer we know, and it has not needed updating in decades. If an open collar feels bare in November, a fine-gauge dark knit under the jacket does the same job with more warmth; we made the full case for that collar earlier this month. A plain white pocket square is welcome. A loud one is doing a different job than you think.

If black feels severe on you — it is not for everyone, and we will say so in the mirror — the answer is a dark jacket with real texture over dark trousers. Low light flattens smooth worsted; hopsack and flannel hold their depth after sunset, which is the same reason we send textured jackets to business dinners. And the shoes carry more of the outfit than they do by day: dark calf, polished the night before, not the week before. A black wholecut like the Magnanni Fleur II is the quietest way to finish the whole thing.

If the card says black tie, or black tie optional

Black tie means a tuxedo. There is no clever substitution; the code is older than the loopholes. Black tie optional means your hosts will be in tuxedos and are politely not requiring one of you — the correct response is either the tuxedo you own or the darkest, best-fitting suit you own, white shirt, dark tie, polished shoes. One honest rule we hold to: a bow tie belongs to the tuxedo. On a business suit it reads as costume; on a tuxedo it is simply the uniform, and a well-made one like Dion's black silk bow tie ($125) will still sit straight at midnight, which is more than most hand-tied efforts can claim by then.

The mistakes we see every December

They are all mistakes of effort, not taste. The day's shirt worn into the evening. The suit that needed a press on Tuesday, attending a party on Saturday. Brand-new shoes making their debut on a night that involves standing for four hours. And jeans, talked into the room by the word festive on the invitation — festive modifies the attire, gentlemen; it does not replace it.

One more thing, because the calendar is unforgiving: a November invitation is answered in October. If the suit needs a sleeve shortened or the waist brought in, our tailors can turn that around in days right now. In December, everyone in tailored clothing is asking at once, and days become weeks. Book a fitting while the rack and the calendar are both still open.

The invitation explains nothing because it assumes you know. Now you do.