Answer:
1) In the material library, set the region to “All” and the material type to “Fabric” in the filter. Select any one of the fabric materials from the list.
2) Activate the “User-defined material” option and specify the user-defined name.
3) Under the Material Values tab, revise the fictitious thickness, density, and so on. The strengths and basis weight (ms) do not affect the calculation and can be disregarded.
4) To specify the modulus of elasticity and shear modulus in terms of force/area, select the Orthotropic Linear Elastic (Surfaces) tab and enter the values there. Note: Changing the thickness in Step 3 affects the values entered in this tab.
To access the user-defined materials and sections for future models, a template can be created. This is shown in FAQ: