Fix Cloth Animation by converting it to Shape Keys and then sculpting.
How it Works:
The Addon converts your animation to shape keys. in other words, it converts Cloth, Softbody or MeshSequenceCache modifier to shape Keys.
So these 3 modifiers:
-Cloth
-Softbody
-MeshSequenceCache (When Importing Alembic)(Marvelous Designer)
it will DUPLICATE your object, (so you Hide/Remove the original mesh).
You can edit the shape keys in sculpt mode or edit mode.