Polygonpen shows how you can create cloth wrinkles using the displacer deformer.

If you find cloth simulation setup too long to manage for quick things, and you want a little more parametric control than what sculpting can offer, have a look at this new tutorial from PolygonPen that shows how you can get cloth without the cloth sim.

The tutorial shows how you can use simple noise and Cinema 4D’s displacer deformer to get cloth wrinkles to change the parameters to your liking.