Women's silk shirt: how to choose one for October

October has that low light that makes everything look prettier, and that indecisive temperature that makes getting dressed difficult: too mild at noon, too cool at 7 p.m. It's exactly the season for a silk shirt - the only piece that slips under knitwear without adding bulk, and that still holds its own when you take off your sweater. But you don't choose a silk shirt the same way you choose a viscose blouse. Four criteria determine almost everything: opacity, weave, momme, and shoulder fit. Here's how I assess them, in that order.

Why October is the month for silk shirts

In summer, silk helps you stay cooler. In October, it serves another purpose: to adapt. The fiber has the rare quality of absorbing moisture without making you feel wet, which changes everything on a day when you go from an overheated subway to a windy sidewalk. And because it is fine, you can layer it without adding bulk: a silk shirt under a knitted cardigan gives you two layers with the thickness of one.

It's also the most versatile piece in an autumn wardrobe, because it does three jobs. Tucked into trousers, it works for the office. Worn open over a camisole, it becomes an overshirt. Worn on its own with a skirt, it works for dinner. Few 150 g garments can do so much.

The four criteria that really matter

1. Opacity: the real issue no one talks about

This is the first disappointment when you buy a silk shirt online: it arrives, you put it on in front of a window, and you can see through it. Opacity depends not only on the thickness of the fabric - it depends on three things that add up.

• Color. It is the most powerful factor, and the one mentioned least often. Ivory, white, and powder pink will always let through more light than black, midnight blue, deep green, or a dense print. With the same weave and weight, a floral print is more opaque than a light solid color.
• The weave. Crêpe, with its matte, irregular grain, diffuses light and conceals. Silk satin reflects it and becomes translucent more quickly. Jacquard, whose pattern is woven into the fabric, locally doubles the thickness and provides better coverage.
• The weight. It matters, but only as a final consideration — and it cannot compensate for very lightweight white satin.

In practice: if you want a light-colored shirt that you will wear on its own, look for crêpe or jacquard rather than satin, and accept that a slip or a thin camisole may be part of the outfit. If you want to forget about it, choose a rich shade or a print.

2. The weave: drape or structure, you have to choose

Two shirts of the same weight can behave in completely opposite ways depending on how the threads are interwoven. Silk satin glides and flows: it creates that fluid, slightly liquid drape that hugs the body. Crêpe de Chine has a subtle grain, a drier hand, and does not cling to the body. Georgette is the most airy and the most fluid — beautiful in sleeves, less restrained at the office. Twill and jacquard, which are more structured, create a shirt that keeps its shape on the shoulder.

If you are hesitating, Colette has detailed these behaviors piece by piece in her silk weave guide — it is the perfect companion to this one.

3. Momme: 16 to 19, and why rarely more

Momme measures the weight of silk. For bedding, it is common to go up to 22 or 25. For a shirt, the trade-off is different: if it is too light, the fabric becomes transparent and fragile at the seams; if it is too heavy, the shirt loses its fluidity and takes on a stiff, almost cardboard-like feel that has nothing silk-like about it.

The right weight for a shirt is between 16 and 19 momme, with 19 as the most versatile benchmark: enough material to drape neatly over the shoulder and remain decent in bright light, enough flexibility to slip under knitwear. Beyond that, you enter the territory of heavy dresses and jackets. The full details are in our momme guide.

4. The shoulders, the fit, the length

This is the criterion we forget, and the one that shows most in photos. Silk has no elasticity: it does not forgive a misplaced shoulder. A shoulder seam that falls two centimeters too low immediately gives a borrowed look, whereas the same fitted shirt appears made for you.

Three simple guidelines: the shoulder seam should sit on the bone, not beyond it; a shirt intended to be tucked into trousers needs extra length in the back, otherwise it rides up all day; and if you like puff sleeves or ruffles, check that the cuff closes - it is what holds the whole structure together.

Which shirt for which use

Three ways to wear it in October

1. Under fine knitwear. Silk shirt, cardigan or crew-neck sweater over it, with the collar and cuffs showing. This is the easiest layering combination of the month, and the one that makes the biggest impression with the least effort.
2. Tucked in, with wide-leg trousers. High-waisted silk or wool trousers, the shirt tucked in, and a slim belt. The silhouette holds its shape, and nothing feels tight.
3. Open, as a third piece. Over a tank top and jeans, the shirt becomes a lightweight jacket. This is the Saturday version, and the one that is forgiving of slightly sheer fabric.

Keeping it beautiful: four steps

• Hand-wash or use a cold delicate cycle, with detergent free of enzymes and bleaching agents.
• Never wring wet silk. Press it rolled in a towel, then dry it flat or on a wide hanger, in the shade.
• Iron inside out, using a warm iron, without direct steam - or keep the steamer at a distance. Silk also relaxes very well in the steam of a bathroom.
• Store on a hanger, not folded for long periods: fold marks leave more lasting creases in silk than the creases from wear.

The details of each step can be found in our silk care guide.

Frequently asked questions

Is a silk shirt see-through?

It depends first on the color, then on the weave, and finally on the fabric weight. A black or densely printed 19-momme shirt can be worn on its own without a problem; a lightweight ivory satin one will call for a camisole or slip. Crepe and jacquard provide more coverage than satin at the same weight.

Which momme weight should you choose for a silk shirt?

Between 16 and 19 momme. 19 is the best compromise between structure, opacity, and fluidity. Above 22, the fabric becomes too stiff for a shirt and loses its drape.

Does a silk shirt wrinkle a lot?

Less than linen, more than jersey. Crepe and jacquard wrinkle noticeably less than satin because their texture breaks up the light and conceals marks. One night on a hanger is generally enough to make the creases from a day's wear disappear.

Can you wear a silk shirt to the office every day?

Yes, provided you choose a weave that holds up and a shade that provides coverage, and have two or three so you can let them air out between wears. Silk handles daily use very well; it's washing it too often and too hot that damages it.

How can you avoid underarm marks?

Let deodorant dry before putting on the shirt, choose aluminum-salt-free formulas that yellow light-colored fibers, and quickly rinse the area with cold water after wearing it rather than waiting for the next wash.

To get started

If you only have one, choose a 19 momme version in crepe or twill, in a rich shade or a print: it's the one you'll wear most often and that requires the least thought in the morning. The second can be the ivory satin you've been dreaming of — then you'll know what to wear it with.

Discover mulberry silk shirts and tops — and, if you want to see the fabric in other pieces, the full mulberry silk collection.

— Awa, for the StudioSoie Journal