Linen GSM Explained: Choosing Weight for Shirting, Dresses and Table Linen

GSM is the single most useful number in a linen specification, and the one most often left out of a brief. It means grams per square metre - the weight of one square metre of the fabric - and it tells you more about how a linen will look, drape, wear and launder than almost anything else you could specify.

This is a reference page. It covers what each weight band is for, what GSM does not tell you, how finishing changes it, and precisely what to write on a tech pack.

The weight bands

A useful anchor: a standard cotton T-shirt is around 180 GSM. So linen shirting at 165 GSM feels familiar in substance while being far more breathable, and 250 GSM table linen is noticeably heavier than anything in most people's wardrobe.

Choosing by product

Shirting

150-190 GSM, and if you only take one number from this page, take 165. It has enough body to hold a collar stand and a placket without interfacing doing all the work, and it is light enough to be worn in genuine heat. Below 150 the shirt gets translucent and the collar collapses; above 200 you are making an overshirt whether you meant to or not.

For hot-climate ranges - Australian summer, Gulf markets, resort - drop to 140-160. For a shirt-jacket or an overshirt meant to hold structure, go 190-220.

Dresses

140-200 GSM for most. The decision is about drape: a fluid, gathered or bias-cut dress wants the lower end, where linen falls rather than stands. A structured shift, a shirt-dress or anything with a defined silhouette wants 180-220, where the fabric holds a line. Wrap dresses sit in the middle, around 170.

Trousers

200-260 GSM. Trousers are the product where brands most often under-specify. Lightweight linen trousers bag at the knee and seat within a season, and the fault is nearly always the weight, not the construction. Wide-leg styles can go lighter than tailored ones because there is less tension on the fabric.

Table linen

190-250 GSM for napkins and tablecloths, 250-320 for placemats and runners. Table linen has a second requirement most apparel does not: it gets laundered hard and often, particularly if it is going to hospitality. Below 180 GSM napkins feel thin and crease without recovering. The 200-230 band is where most of our kitchen linen and home textiles sit, and it is a reliable default.

Bags

280-400 GSM. A tote that will carry weight needs a heavy base cloth, and this is one place where going heavier rarely hurts the product. Our tote range is built at the upper end for that reason.

What GSM does not tell you

This is the part that separates a specification from a wish. Two fabrics at an identical 180 GSM can behave completely differently.

• Yarn count. A fine yarn woven densely and a thick yarn woven openly can land on the same weight and look nothing alike. Fine-yarn linen is smoother and more even; thick-yarn linen has the slubby, textured character many brands actually want. Specify the character you want, not just the weight.
• Weave construction. Plain weave, twill, herringbone and basketweave at the same GSM differ in drape, opacity and how they take a crease.
• Finish. The single biggest variable in how a linen feels. The same greige cloth can be delivered crisp, softened, stonewashed or enzyme-washed, and those four hand-feels are further apart than a 40 GSM weight difference.
• Blend. Linen-cotton and linen-viscose blends at the same GSM drape differently and crease less. If your customer complains about creasing, the answer is often a blend or a finish rather than a weight change.

How washing and finishing change the number

GSM is not fixed between the loom and the shop floor, and this trips up brands who specify a greige weight and receive a finished fabric that measures lighter.

Finishing reduces weight. Garment washing, stonewashing and enzyme softening remove loose fibre and relax the structure. Expect a modest reduction, commonly in the region of 2-5% depending on the process and its intensity. Heavier washing means softer hand and lower finished weight.

Shrinkage is the bigger effect. Untreated linen commonly shrinks 3-7% on first wash, and it shrinks more in length than in width. This is normal fibre behaviour, not a defect, but it has to be designed for. There are two ways to handle it: pre-shrink the fabric before cutting, or build the shrinkage allowance into the pattern. Pre-shrinking is more predictable and is what we would normally recommend for anything where fit matters.

Interaction: shrinkage raises GSM. A fabric that shrinks pulls the same yarn into a smaller area, so the finished weight per square metre goes up even as total weight comes down. This is why you must state which GSM you are specifying.

What to write on the tech pack

Six lines. This is the whole of it, and getting these right removes most of the ambiguity that causes a second sampling round.

1. GSM, with a tolerance, on the finished fabric. For example: "185 GSM ±5%, finished". Woven fabric is a natural product and an exact figure is not achievable; ±5% is the normal commercial tolerance. Saying "finished" rather than "greige" removes the single commonest misunderstanding.
2. Fibre composition by weight, in descending order. You need this for UK and US labelling law anyway, and it drives customs classification.
3. Weave construction - plain, twill, herringbone - and yarn character if it matters to you (fine and even, or slubby and textured).
4. Finish. Crisp, softened, stonewashed, enzyme-washed. Be specific: "soft handle" means different things in different factories.
5. Shrinkage tolerance and whether the fabric is pre-shrunk. For example: "pre-shrunk, residual shrinkage max 3% warp and weft".
6. Fabric width, because it drives cutting efficiency and therefore your cost per garment.

Two more worth adding where relevant: colourfastness requirements - to washing, to rubbing, and to light, which matters far more for a Southern Hemisphere or Gulf range than a Northern European one - and any restricted substances standard your own customers require. We manufacture to OEKO-TEX standards and provide testing and compliance documentation to buyer requirements.

The rest of what belongs in a brief is covered in our walkthrough from tech pack to first sample.

A note on European flax

The linen we source is woven from flax grown in Western Europe - principally the coastal belt running through northern France, Belgium and the Netherlands, where the maritime climate suits the crop and it is grown without irrigation. That matters for weight consistency as well as provenance: long, strong, evenly graded fibres spin into more consistent yarn, and consistent yarn is what lets a mill hit a GSM target within tolerance run after run.

The number is a starting point

Everything above is a guide, and a guide is not a substitute for touching the cloth. Two linens at the same GSM from different mills, with different yarn and different finishing, are different fabrics. This is genuinely a material you should not commit to on a screen.

We ship swatch cards internationally across the weight range, which is the sensible first step for any brand at the specification stage. Our linen page covers what we weave, and fabric by the metre is available alongside finished product.