PolyCloth Tool for Cloth Sculpting in 3DS Max

The plugin supports workflow similar to Blender and ZBrush pipelines in 3DS Max. It allows users to add cloth-like folds and wrinkles.

There's a single cloth sculpting brush that can be modified using shortcut keys. The default brush adds cloth-like folds as the user sculpts. You can also hold down modifier keys to pinch the surface, smooth out existing wrinkles, and more. 

It also features some numerical parameters including Iterations, Damping, Plasticity, Bendiness, and other ones to control the deformation.

You can learn more and get it for $59 here.