Momme vs Denier: How to Read Silk Specs Before You Order

What momme measures

Momme is a unit of silk fabric weight, equal to about 3.75 grams per square meter. A higher momme means a heavier, more structured cloth, and a lower momme means a lighter, softer one. The number comes from the weight of a standard bolt, and it is the figure a mill quotes when you ask how heavy the silk is¹. For gowns the useful range is narrow, and it helps to think of it as a band rather than a single number. A 19 momme double crepe is the entry weight, light enough to move and heavy enough to hold a silhouette, while a 22 momme fabric has more presence and is what a structured evening gown wants. Below 19 the cloth starts to feel like a lining; above 30 it reads as a jacket or coat weight. For example, the same dress cut in 19 momme drapes softly, where the 30 momme version stands away from the body.

What denier measures

Denier is the yarn's linear density, measured as grams per 9,000 metres, and it describes the thread rather than the cloth. The standard mulberry raw silk yarn is 20/22 denier, reeled from cocoons and wound into hanks for weaving², with a finer yarn carrying a lower denier and a coarser one a higher denier. The two numbers work together, with denier setting the thread and momme setting how much of that thread goes into a square meter of cloth. Two fabrics can share a denier and still differ in momme, because the weave density and the number of plies change the weight without changing the yarn. That is why you read both measurements rather than one. The most common mistake is quoting a momme and ignoring the denier, which produces a cloth that is the right weight but the wrong hand, because the yarn underneath it is not what the design assumed.

Matching spec to use

The right weight depends on the job the silk has to do. For a structured gown, choose a heavier momme double crepe or dupioni, because the cloth has to hold a shape without collapsing under its own weight. For an overlay, choose a lighter fabric that drapes instead of standing. For an embroidery base, choose a stable greige, because the ground has to hold still while thread is stitched into it. The rule is simple: match the spec to the end use. A gown cut from overlay-weight silk will not hold its line, and an overlay cut from gown-weight silk will not fall. Naming the end use before you name the weight avoids the most common ordering mistake.

Related: dupioni silk greige · raw silk yarn for weaving

Specifying your order

Name the end use first, whether that is a gown, an overlay, or an embroidery base, then pick the weight that matches and confirm the hand on a swatch before ordering bulk.

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