Curtain 3D model 121 (Polygon mesh 3D model) is available on CGTrader for $8. Original author: karina-e. Specs: 711817 polys, 392105 verts.
OBJ (OBJ, filesize: 30.1 MB), MAX (Autodesk 3ds Max, filesize: 12.5 MB), FBX (Autodesk FBX, filesize: 23.9 MB)