Use Bending intensity which is the resistant against being bent, to adjust the stiffness of fabric. The higher the value, the stiffer it becomes such as denim and leather, and the lower the value, the more it becomes suitable for draping materials such as silk. The Bending intensity for the weft and warp directions can be set separately likewise the real fabrics.
Object Browser ▶ Fabric Property Editor ▶ Physical Property ▶ Detail ▶ Bending-Weft/Warp
Expressing materials with Weft (Horizontal) bending intensity
Expressing materials with Warp (Vertical) bending intensity