Once you have the hang of things, and if you just require a static pose rather than animated:-

Conform the clothing to a posed figure.
Export out the clothing as Wavefront object (.obj) ensuring that the option to weld is selected.
Delete the clothing in the scene.
Import the clothing with none of the import options selected.
Treat the now static clothing prop as dynamic clothing in the cloth room.
Do not select the "Drape from zero" option.

You'll probably find that just a few frames of simulation will give the cloth the relaxed appearance that you are looking for.

You may want to save a material collection for the clothing prior to export then apply that collection to your imported prop.