The rig kit doesn’t have a rig base for pants. It’s intended to help out with skirt and dress rigging, which can be difficult. For other garments you would use the Transfer Utility in DAZ Studio 4 Pro (which is still free) and copy from Genesis with the Pants template on. There are templates for loose and tight pants, loose and tight shirts, etc., and you can use it for both sexes. Eventually you will probably want to edit the copied rigging, but it’s a good place to start.