What is Denim?

Denim is a sturdy woven fabric in a warp-faced twill construction. In classic denim, the warp yarns are coloured, often indigo dyed, while the weft yarns are white or lighter in colour. This construction makes the front side look more blue and the reverse side lighter.

The diagonal twill line is an important visual feature of denim. Traditional denim is made from cotton, but modern versions can also include polyester or elastane. Rigid denim has little to no stretch, while stretch denim is often used for fitted garments that need more freedom of movement.

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Specifications

Construction Woven fabric, usually warp-faced twill
Composition Usually cotton, cotton/polyester blend or cotton with elastane
Fabric weight Usually medium to heavy, commonly around 200 to 450 g/m², depending on yarn thickness, weave density and finish
Stretch Little to no stretch in rigid denim; moderate stretch when elastane is addedAbbreviationsCO = cotton, PES = polyester, EL = elastane
Appearance Diagonal twill structure, darker face side, lighter reverse side, firm and casual look

Denim

Denim is a strong woven cotton fabric with a clear diagonal twill structure. It is best known for its coloured warp yarns and lighter weft yarns, which create the typical denim look with a darker face and a lighter reverse side. The fabric has a firm hand feel, good durability and a casual appearance that becomes more characteristic with wear.

Denim is especially suitable for trousers, jackets, skirts, shirts, children’s clothing and workwear-inspired fashion garments. Depending on the weight, finish and composition, denim can feel rigid and structured or softer and more flexible. Stretch denim adds extra comfort while keeping the recognisable twill appearance.

Applications

Jeans and trousers
Jackets and overshirts
Skirts and dresses
Dungarees and pinafores
Workwear-inspired fashion garments
Bags and accessories
Structured casualwear

Care Instructions

Denim is usually washable at 30 to 40°C, depending on the composition, dye and finish. Wash denim inside out to help reduce colour loss and visible abrasion. Wash dark denim separately or with similar colours, especially during the first washes. Do not bleach. Air drying is preferred, as high-temperature tumble drying can cause shrinkage, colour fading or loss of elasticity in stretch qualities.

Certifications

OEKO-TEX Standard 100 may be available depending on the specific article. Organic cotton, recycled cotton or recycled polyester variants may have additional certifications, depending on the fabric and supplier.

Practical Tip

Pre-wash denim before production when shrinkage or colour bleeding may affect the final result. For garments with visible panels, cut all pattern pieces in the same direction to keep the twill line and colour appearance consistent.

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posted on
04/06/2026