More curtain models:
https://3dsky.org/collection/shared/5249944 

Set of blackout curtains with tulle
Fabric color can be easily changed in the Falloff map

3dsmax 2013 and FBX file with Vray materials
3dsmax 2013 and FBX file with Corona materials
Preview materials from Corona
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Materials are compatible with older versions of Corona, all materials are CoronaLegacyMtl

For Vray versions below 3.1, some materials may not be displayed in MatEditor and during rendering. To fix this, set the value to Blinn in the BRDF section.