Reading a Poplin Construction: What 40x40 and 132x72 Actually Tell You

Yarn count: the first two numbers

In the cotton count system, the number describes how many 840-yard hanks weigh one pound, so a higher number means finer yarn. A 60s yarn is finer than a 40s, which is finer than a 30s. Finer yarn produces a smoother, softer, more expensive cloth. The first figure is warp and the second is weft; they are often, but not always, the same.

Reed and pick: the second two numbers

Reed is the number of warp threads per inch and pick is the number of weft threads per inch. 132x72 means 132 warp and 72 weft threads in every inch of cloth. Higher numbers mean a denser, stronger, heavier fabric. This is where poplin gets its fine crosswise rib: the warp count is much higher than the weft, so the finer warp threads bend over the weft.

Common constructions and what they are used for

Why weight alone misleads

GSM tells you how much material there is, not how it is arranged. A fabric of coarse yarn in a loose weave can weigh exactly the same as one of fine yarn in a dense weave, and the two will look, feel, drape and wear completely differently. When a supplier quotes only a GSM figure, ask for the construction.

Greige versus finished: confirm which you are being quoted

Greige is unprocessed loom-state fabric. It is cheaper and it changes dimensions on processing: a 63 inch greige typically finishes around 58-60 inches, and weight changes too. Buyers who plan on the greige width rather than the finished width make an expensive mistake.