Understanding Fabric Weight (GSM) and Why It Decides Your Product
GSM in plain language: how fabric weight quietly shapes drape, cost, season and the very first impression a customer has of your brand.
Before you fall in love with a print or a colour, you have to understand weight. In thirty years I have watched more first collections fail on fabric weight than on design. GSM (grams per square metre) is the number that tells you how heavy a fabric is, and it decides more than most new founders realise.
What GSM actually means
GSM is simply the weight of one square metre of fabric. A light summer voile might sit around 60–90 GSM. A everyday t-shirt jersey lands near 160–200 GSM. A structured denim can run past 350 GSM. The number is not "good" or "bad". It is a promise about how the finished garment will behave.
Why it decides your product
- Drape. Lighter fabric flows; heavier fabric holds shape. Your silhouette lives or dies here.
- Season. Weight is climate. Get it wrong and the garment never leaves the shelf.
- Cost. More grams means more fibre means more money, per metre and across the whole order.
- Perceived quality. A customer feels weight before they read your label. It is your first, silent pitch.
The practical move
Ask every supplier for the GSM before the price. Then order a swatch and hold it. Numbers describe fabric; your hands confirm it.
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