drapery_curtains.gh (42.5 KB)
Here’s a quick go at creating something like the top part of those curtains.
The part in the green box sets up the fabric properties, and if changing the shape you can probably leave this part unchanged. The important bits if you want to model other stuff are the input mesh (which should be made up of square quads), and some attachment points to move to target locations.
See also the examples posted in this thread: