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Fabric weight explained: what does g/m² mean?

Fabric weight explained: what does g/m² mean?

Fabric weight is usually expressed in g/m², which means grams per square metre. It tells you how much one square metre of fabric weighs. A higher g/m² usually means a heavier fabric, while a lower g/m² usually means a lighter fabric.

Fabric weight helps you estimate how a fabric may behave, but it does not tell the full story. Fibre type, yarn thickness, weave or knit construction, density and finishing all influence drape, stretch, transparency and comfort.

Why fabric weight matters

Fabric weight affects the way a garment looks, feels and performs. Lightweight fabrics often feel airy and fluid, while heavier fabrics usually give more coverage, structure and warmth.

Still, two fabrics with the same g/m² can behave very differently. A 220 g/m² jersey may feel soft and flexible, while a 220 g/m² woven cotton can feel firmer and more stable. Always judge fabric weight together with construction and composition.

Lightweight fabrics

Lightweight fabrics are often used when softness, movement or transparency are part of the design. They can feel breathable and delicate, but may need lining when the fabric is sheer.

Common lightweight fabrics include muslin, voile, georgette and light crêpe. These fabrics are suitable for loose silhouettes, layered garments and summer styles.

Best for:

  • Blouses
  • Loose summer dresses
  • Overlay layers
  • Scarves
  • Lined occasionwear

Medium-weight fabrics

Medium-weight fabrics are often the most versatile. They can offer enough body for everyday garments while still allowing comfort and movement.

Examples include cotton jersey, poplin, cretonne, French terry and medium crêpe. Depending on the construction, these fabrics can be used for tops, shirts, dresses, skirts, sweaters and relaxed trousers.

Best for:

  • T-shirts
  • Shirts and blouses
  • Dresses with light structure
  • Skirts
  • Sweaters

Heavyweight fabrics

Heavyweight fabrics usually provide more structure, warmth and durability. They are often used for garments that need shape or extra resistance during wear.

Examples include denim, corduroy, fleece, heavy jersey and some jacquards. These fabrics work well for trousers, jackets, overshirts and cold-day garments.

Best for:

  • Trousers
  • Jackets
  • Overshirts
  • Dungarees
  • Warm layers

Practical tip

Use g/m² as a starting point, not as the only selection rule. Always check the fabric’s stretch, drape, opacity and surface before linking it to a garment.

When comparing fabrics, test a sample by folding, stretching and holding it up to the light. This gives a more reliable impression than fabric weight alone.

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