Curtains with goblet pleats with tiebacks on both sides, double curtains, and a Roman shade.
The scene includes a simplified window model in the wall and a simplified cornice model.
The curtain set is grouped for convenience. In the export file, all objects are ungrouped.
The model colors can be easily changed in the material settings.

https://3dsky.org/collection/shared/5255126  my curtain collection.

For Corona render, it is recommended to use version 1.5 or higher, as the glossiness of materials is set with PBR in mind.

If you are working in V-Ray version lower than 3.1, please note that the materials in the BRDF section are set to Microfacet GTR (GGX); if your version is older, the BRDF field will be empty. Choose Blinn, Phong, or Ward – whichever is preferable for you.