Similar models:
https://3dsky.org/collection/shared/5103621 

The archive includes:
1. Semi-transparent bath (shower) curtain 200×200 cm (white gray).
2. Rod for bath (shower) 180 cm.

Polygons 61 297 Vertices 62 063.

The following were used as references:
Bath curtain Kela Largo 180×200 white
Bath curtain Kela Laguna 180×200 Gray

If transparency interferes you can reduce the value of translucency fraction and set the color to opacity lighter.

Who works in V-Ray version lower than 3.1 be careful in the materials in the BRDF section there is Microfaset GTR (GGX) if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you