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

Wide tulle curtain with loops
Fabric color can be easily customized in Corona Color or Vray Color

3dsmax 2013 file and FBX with Vray materials
3dsmax 2013 file and FBX with Corona materials
Preview materials Corona
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All CoronaLegacyMtl materials compatible with Corona versions from 1.5

For Vray versions below 3.1, some materials may not show up in MatEditor and when rendering. To fix this, set the Blinn value in the BRDF section.