You are getting on well! 

Yes what you do is more or less the route available for garments for application in Poser or DS: write the result for 'pick up pose', thin, welded, to .fbx, import into Poser, and go Cloth Room or Fitting /Setup Room.  You can use also .obj but more potential problems there with textures. 

If one owns MD one can export 'thick', and therefore 'unwelded' models of the garment shaped for the posed figure and just load it as a prop to render. This is typically the route the MDBridge for Poser was made for. The simulation work is done in MD and not in Poser. The MD Bridge uses .obj format because Poserpython at the time of developing offered no means to import. FBX.

With the free Jinny application CLO has launched now one can do tailoring/customisation and fitting without the need for having MD, and save in CLO format. The remaining hurdle is export to .FBX. For that you need MD or CLO3D, or use the service from CLO expected end Q2 this year. They need to get their pay somehow so they will most likely charge a fee. Same service can be rendered though by anyone who owns or runs a tryout of  one of these programs. This can be a scripted operation,  no human intervention needed.