NVIDIA GameWorks Integration

Hi guys.i have three questions about flex and skeletal meshes.
1)if i want to use flex cloth for a skeletal mesh for example should i modelling arms and cloth separately in maya or can be integrated?

  1. is it possible parts of a skeletal mesh be cloth and other parts are not.for example i want the fabric on the arm be cloth and other parts are not?
  2. is it possible import an apex file(animated apex cloth) from maya and applying it on a flex cloth on a skeletal mesh?