import the obj for any clothing. In the cloth room set up a simulation with collision to the ground and turn on self collision. Start the simulation with the clothes just above the ground and at an angle to it.

Run the simulation and check the result. If it looks ok , export an obj of the clothes at the frame you like. It can be imported againn and saved as a prop.

If you dont use self collision the cloth makes a flat puddle.

You can use a prop table or chair to make "draped over chair, thrown on table etc"