Silk Pajamas vs Lingerie as a Gift: Size, Silk, Care

Silk pajamas are the safer gift when you are not sure of the person's size or of where the relationship stands; lingerie is the better gift when you know both. A pajama set sold in small, medium and large forgives a guess. A bra sized by band and cup does not, and a lingerie gift also says something about intimacy that pajamas leave unsaid.

That is the short answer. The longer one depends on what the silk is, how it will be washed, and who is opening the box.

Why silk pajamas forgive a wrong size

Silk pajama sets are commonly sold in letter sizes, small, medium and large, rather than one exact dress size. The tops are cut loose, the trousers have an elastic or drawstring waist, and nothing is meant to sit tight against the body. If you guess one size too big, the set still looks like pajamas. If you guess too small, a woven fabric with no stretch will pull across the shoulders and hips, so a size up is the kinder mistake.

A bra has no such margin. It is sized in two dimensions at once, the band around the ribcage and the cup, and a gap of one band size or one cup size can make it useless. Even a bralette, the most forgiving bra there is, still has to match the band. The only reliable way to buy one blind is to read the size off a bra the person already wears and loves, and to buy from the same brand.

Momme weight, read off the label

Silk is weighed in momme (written mm). The unit is old and odd: it is the weight in pounds of a piece of silk 45 inches wide and 100 yards long. One momme works out to about 4.34 grams per square meter, so a 22 momme silk weighs roughly 95 grams per square meter.

Weight is a property of the cloth, so it tells you how dense and opaque the fabric is, not whether the silk was well reeled or well woven. For sleepwear the useful numbers are narrow. Charmeuse, the satin-woven silk most pajamas are made from, runs from about 12 to 30 momme. Lilysilk, which sells silk sleepwear, describes 19 momme as a common sleepwear weight but less durable, and calls 25 momme too heavy for nightwear. In practice, a label that says 19 or 22 momme is normal; a label that gives no momme at all is worth a second look.

Mulberry silk, charmeuse and satin that is not silk

"Mulberry silk" means silk from the domesticated silkworm, Bombyx mori, whose larvae eat almost nothing but mulberry leaves. The species has been bred for so long that it no longer exists in the wild. Because the cocoons are harvested before the moth emerges, each one can be unwound as a single continuous filament, which Wikipedia puts at 300 to about 900 meters. Long filaments give the smooth, even yarn that shows in a glossy pajama.

Wild silks such as tussah are a different product. The moth breaks out of the cocoon, cutting the thread, and the fiber is rougher and harder to dye. They make good jackets and poor pajamas.

Charmeuse is a weave, not a fiber. It has a glossy face and a matte back, and it is woven in silk, polyester, rayon and blends. A set labeled "satin pajamas" with no fiber content is almost always polyester. That can be a fine gift, cheaper and easier to wash, but it is a different gift, and our comparison of microfiber and satin explains what the fiber changes. The satin entry covers the weave itself.

Washing silk, and what the care label is allowed to say

Ask what the person will actually do on laundry day. Silk is a protein fiber. Persil's silk guide asks for a mild non-biological detergent, which means one without enzymes, no wringing or twisting, and drying flat or hung out of direct sunlight, never in a tumble dryer. Where the label allows the machine, it says to use a cool delicate cycle no warmer than 30C (86F), a mesh laundry bag and the shortest spin. Many silk sets do not allow the machine at all.

The care label is more informative than it looks. Under the US Federal Trade Commission's Care Labeling Rule, a garment may be labeled "Dryclean Only" only if the maker has evidence that washing will damage it. A plain "Dryclean" is a complete instruction too, and a garment that could be either washed or dry cleaned needs to name only one method. So "Dryclean" without "Only" does not mean the silk cannot be washed. "Dryclean Only" does. If the person you are buying for will never take pajamas to a cleaner, that word on the label settles it.

When lingerie is the right gift, and when it is not

Lingerie works as a gift in a relationship where the two of you already talk about what the other likes to wear. You know the size because you have seen it on a tag. You know whether she wears lace or plain microfiber, black or pale colors, underwire or none. In that case a set chosen with care is a more personal present than pajamas could be.

It is the wrong gift in most other situations. Early in a relationship it can read as a request rather than a present. For a colleague, a friend, a relative or an in-law, it is not appropriate at all, and silk pajamas, or a silk robe, is the gift that sits in the same drawer without the same message. Buying lingerie in a size you hope for, rather than the size the person wears, is a reliable way to make it go wrong.

A silk robe or slip splits the difference

There is a middle ground. A silk robe ties at the waist and fits almost anyone in a broad size range. A bias-cut slip in silk charmeuse reads as lingerie but is sized like a dress, so a small, medium or large is enough. Both carry the same momme and care questions as pajamas, and both avoid the band and cup problem entirely. For someone whose size you half-know, a robe at 19 momme is the gift least likely to go back to the store.

Last updated October 28, 2026

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