I'm working up a concept for an interior scene, and not wanting to miss any details, I want to model the window coverings as well. For what I have in mind, I'm pretty sure will need to use cloth sim with pinning, but the pinning application is the problem. With as many places as the object will need to be pinned during the sim, I don't know how to go about setting it up. I've attached a basic reference for an idea of what I'm going for. This will be rendered in cycles when all is said and done also.
For such a model it should be sufficient to model it by hand using the cloth simulation would be a task too complicated for a model such as this. Using box modeling strategy and maybe subdividing the faces would suffice.
This is Unless you will be animating the model too, then cloth sim is the way to go.