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The email lands in the first week of November, sent by whoever has been planning it since Labour Day: a restaurant downtown, a date in mid-December, and a dress code that either says nothing or says the one word that helps nobody — festive. The office holiday party is the most delicate dressing assignment of the year, and not because the clothes are hard. In October we decoded cocktail attire for rooms full of strangers. This room is different. It is colleagues — the same faces that will be across the table on Monday at nine, and at every coffee machine between now and your next review.

So here is the principle we repeat across the counter every December, now in writing: the party is off the clock. The impression is not.

The office holiday party is still the office

Nobody's reputation was ever made by what he wore to the office holiday party. A few have been quietly dented. In our experience the damage comes from three directions, and all three are errors of calibration rather than taste.

The first is the costume. If your office runs an ugly-sweater contest, that is a daytime event with its own rules, and we are no help to you there. The evening party is not that event, and the novelty sweater that was funny at the noon potluck reads very differently at nine beside a senior partner holding a glass of Burgundy. The second is the opposite failure: the suit you wore all day, carried into the evening on momentum. We said it about cocktail invitations and it holds doubly among colleagues, because colleagues know exactly what you had on at lunch. The shirt, at minimum, must change. The third is overshooting — arriving a full step above the man who signs the invitations. Dress half a step up from an ordinary office day and you land precisely where you want to be: visibly up for the evening, visibly not auditioning.

Black earns its evening

We have argued since October that black is a colour best held for evening. The office party is precisely the evening we meant. This fall ETON — the house we know best for its shirt collars — sent us something we did not expect: a black double-breasted soft jacket in wool hopsack woven by Marzotto in Italy ($1,100). The hopsack is the point. In a restaurant lit from table height, flat black cloth goes dead; an open weave holds depth, and the jacket reads composed rather than severe. The double-breasted front is the other point. A double-breasted jacket is at its best buttoned and standing, and an office party is a standing event — two hours on your feet, one hand occupied. Worn over a fine black or charcoal knit with dark gray trousers, it is the most evening a man can look without a single formal garment on his body. Two sizes on the wall as we write this. We mention that not to rush you; December will.

Festive without costume: one deep colour

Last week we made the case for wearing colour in winter one deep piece at a time. Here is where that advice earns a December evening. Jack Victor's blackberry check Montana sport jacket ($1,098) is cut in Montreal from Super 110's wool woven in Italy, and its trick is distance. Across the room it reads nearly black — calm, senior, composed. At conversational range it resolves into a deep berry check. That is the office-party arithmetic exactly: quiet to the room, festive to the person you are actually talking to. Over a black fine-gauge knit it needs no further decoration, and it will not spend January in the closet apologizing — it works every tie-optional week until spring.

Three versions of the same party

The invitation decides more than the hour. The restaurant buyout gets the full formula above. The cinq à sept in the office itself asks less: keep the day's tailoring, change the shirt or swap it for a knit, and you have marked the occasion in ninety seconds. The party at the boss's house is the trickiest room of the three. You will surrender your shoes at the door, Montreal being Montreal, so the socks are part of the outfit — we wrote a whole guide to that in October — and the host outranks everyone, so stay half a step below whatever he is likely to wear in his own dining room. At all three: dark cloth forgives a jostled glass of red, and the drink lives in your left hand so the right one stays dry. These are not style rules. They are survival notes.

The calendar is the last piece. The party is a December event, but it is a November errand. Sleeves, a waist, a pressed shirt — our tailors on Decarie turn that around in days right now, and in weeks once December arrives. Walk in, or book a fitting, and have a look at the jacket wall while the racks are still whole. The party is one evening. The people in the room are your entire year. Dress for both.