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

Wide curtain draped on curtain tape
Sheer linen tulle in two light natural shades

3dsmax 2013 and FBX file with Vray materials
3dsmax 2013 and FBX file with Corona materials
Preview materials from Corona
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The materials are compatible with older versions of Corona all CoronaPhysicalMtl are additionally duplicated by 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.