I have a confession about ski trips, which is that I plan the evening outfit before I have thought about a single turn. Within approximately four seconds of a friend saying the word Aspen, I am already deciding on the boots, the sweater, and where the hat will sit once we are indoors. I have no shame about this.

But somewhere between the base layers, the shell jackets and the group chat about who is bringing what, dressing for the mountain has gotten a little exhausting. We are told to pack light and also to bring a full second wardrobe for dinner. We are told to dress for the cold and also to look like we have never been cold in our lives. The apres ski outfit is the one part of the trip that nobody gives you a manual for.

Which brings me to the Moon Boot. On July 20, 1969, a shoemaker named Giancarlo Zanatta sat in front of a television in Montebelluna, Italy, watching Neil Armstrong step onto the moon, and he was struck by the boots the Apollo 11 crew wore. In 1970 his company, Tecnica, released an after-ski boot that closely mirrored them. The company later said skiers needed a comfy, warm shoe for the post-ski party, which is the clearest brief for an apres ski outfit I have ever read.

Some of what I found made me want to buy a sweater with a snowflake on it. Some of it made me want to lie down on a shearling rug and not get up. And some of it made me realize that the outfit for the bar is a real design problem, one that people have been solving for decades. So, here are five lessons for the part of the trip that starts when the lifts close.

Confession: I judge a ski lodge by its knitwear before I judge it by its fireplace. A good sweater is the one piece that can walk from the lift line to the bar without apologizing, and anyone typing ski outfit women into a search bar is usually hunting for exactly that.

The pattern has a better story than most. Fair Isle is a remote island between Orkney and Shetland, and the V&A notes that sweaters in the Fair Isle style, as we know them today, were not produced until the First World War. They are built from horizontal bands of motifs in two colors, crosses, diamonds and eight-pointed stars. The Prince of Wales wore one for golf in the 1920s, and a vogue followed.

Picture her by the fire in the Dôen Field Fair Isle sweater, the most literal version of the idea here. The JW Anderson intarsia sweater is the louder cousin, and the Leset James argyle merino and the &Daughter Ava argyle cardigan trade stripes for diamonds. If you want softness without a pattern, the Sanderlak alpaca and wool-blend sweaters come in orange and blue, the Lauren Manoogian alpaca-blend cardigan is beige, and the Dôen Olympe jacquard cardigan is yellow.

Here is the test: squint at the sweater from across the room. If the bands still read as bands, it will hold up under a puffer, a scarf and the dim light of a chalet.

What I would skip: a patterned sweater with a patterned scarf and a patterned hat. Pick one loud thing and let the rest be quiet, although I will admit the rule gets harder to follow once the cocoa arrives.

Nobody has ever remembered a bad boot as a minor detail. The truth about après-ski is that you spend most of it walking on packed snow in a place that was never designed for fashion, so the boot is the first decision, not the last.

The Moon Boot is the obvious place to begin, since it started life as an after-ski boot. The edit here has the Moon Boot Icon Low in brown shell and a white version trimmed in fleece, both short enough to wear with a skirt or with trousers tucked in. For something that reads more like a regular ankle boot, the Varley fleece-lined suede boot in gray is the quiet choice. The Manolo Blahnik Mircus is a shearling-trimmed suede boot in light brown, and Gianvito Rossi makes a camel suede version with a logo debossed into it.

The Bogner Les Arcs boot in cream shearling is the one I would pick for a woman who wants the whole mountain-resort look. The Moncler Altive in army green and the Moncler Trailgrip Apres in black are quilted shell boots, the closest thing here to a puffer for your feet.

Here is the test: before you pack a pair, check the label for what the upper is made from and whether the sole has real tread. Suede and shearling want a dry spell, so if you expect slush, choose the quilted shell.

What I would skip: a suede boot on a day when the forecast says rain. Although if the boot is beautiful enough, I understand the temptation to take the risk.

Ski trousers have a more glamorous history than they get credit for. Skiing History tells us that in the summer of 1952 Maria Bogner spent her time figuring out how to cut the maddeningly stretchy new Helanca material into ski pants. Before that, skiers were used to choosing among black, navy, gray and forest green, and she brought in brighter colors and a closer fit. By the late 1950s, the standard rig for a fashionable skier was stretch pants, a light poplin jacket and a wool sweater.

The same logic still works after dark. The Jil Sander stirrup pants in gray wool-blend stretch-gabardine are the direct descendant of that look, and the Joseph Tafira stretch-gabardine pants in dark brown are cut straight. The Tove Viva crepe skinny pants and the Acne Studios stretch-twill pair are sleek black options for the night. The Almada Millie high-rise leggings and the Gucci stretch-jersey pair are the easiest, and the Arma paneled suede leggings in brown and taupe are the dressed-up ones.

Here is the test: sit down, then stand up, then sit down on the lodge's lowest sofa. If the pants stay put and nothing pulls, you can wear them to dinner without a second thought.

What I would skip: leggings with a short sweater when you are walking across a parking lot in the dark. Add a longer layer on top, although I will say the suede ones can carry themselves without much help.

Down gets all the credit for warmth, and it deserves some. Eddie Bauer created a down jacket in 1936 after the cold almost killed him, and he called a prototype the Blizzard Proof. Shearling has its own heroic backstory: Leslie Irvin designed the classic sheepskin flying jacket, and shearling jackets are recognized as the warmest flight jackets. One keeps you alive on the trail, the other made it from the cockpit to the cocktail hour.

At the bar, I would reach for shearling. The Brunello Cucinelli belted shearling coat in brown is the smooth, grown-up version, and the Veronica de Piante Romy shearling coat in red is the opposite, a coat that announces you before you walk in. The Joseph Kyro is reversible, so it works as two jackets in a single suitcase. The Stouls So Linda is a black leather jacket trimmed in shearling, and the Rixo burgundy suede jacket has shearling trim.

If you do want padding, the Loewe quilted jacket is trimmed in leather, the Sacai padded coat has plush trim on wool, and the Maison Margiela quilted shell coat is plain black and very good at being plain.

Here is the test: wear the coat indoors for ten minutes. If you want it off, it is a coat for the walk and not the bar.

What I would skip: a heavy shearling coat for a short walk between two warm rooms. Although I would still take it for the picture.

Nobody warns you that the hat becomes part of the outfit the moment you decide not to take it off. By the second drink, it is the first thing anyone sees, and the gloves are what you hold on to the whole night.

For the classic, the Polo Ralph Lauren cable-knit beanie in beige, with its embroidered logo, has a matching pair of cable-knit gloves, which is as close as it gets to dressing like a catalogue page. For something warmer looking, Yves Salomon makes shearling earmuffs, one in gray with wool trim and one in off-white with suede trim, and they leave your hair free. The Lemaire Chapka is a trapper hat in brown twill trimmed with shearling, the hat for a woman who is not afraid of being looked at.

For gloves, the ARCH4 Jessie ribbed cashmere gloves in black and the ARCH4 Alaric pair in cream are the soft ones. The Agnelle Sakura Tabi gloves are black leather trimmed in wool, and they are the ones I would take to dinner.

Here is the test: put the hat on, then put the hood of your jacket up. If both fit without looking like a bundle of laundry, you are set.

What I would skip: earmuffs, a hat and a hood all at once. Pick two, although I am not going to tell you which two.

Here is what the five lessons add up to. A sweater with a story, a boot that can walk on snow, trousers that work at dinner, a coat that survives a warm room, and a hat you do not mind keeping on. None of it is complicated, and all of it is easy to forget when the packing list starts to grow.

I will still be tempted by the third sweater and the second pair of boots. I will still pack for the bar before I think about the slope. But I think the Moon Boot has the right idea: the best after-ski piece is whatever you were happiest to come home to, and a warm shoe for the post-ski party is not a small ambition.