A recap of modeling and rigging conformers 101:

• ALWAYS MODEL AROUND THE BASE OBJ OF THE CONFORM TARGET
• Do not model around morphs, because your model's geometry will differ enough from the conform target that the donor rig will require a ton of extra adjustment to work with that specific morph, and it won't work the same (or at all) with any other morphs.  Adding fitting morphs will be practically impossible.
  - Do not model around a posed rig, because the joint endpoints of your conformer will require manual adjustment for anything that was bent with the conform target you modeled around.  Shoes are the sole exception - they still require manual adjustment, but the result is worth it (if you can get it to work)
• Do not model around scaled bones.  If you do, when you apply the donor rig, once again you will have to do a lot of manual adjustment of the conformer.

Stephanie 4 is some morphs and scale changes for V4.  So how do you model and rig conforming clothing for Stephanie 4?  You do not, you model and rig it for V4.

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