These tutorials go into a lot of it. It explains how to use La Femme's dev rig to transfer morphs and joint centers to clothing. 

Instead of using a dev rig for Dawn 2, you can try copying joints and morphs from Dawn herself.  The principles are pretty much the same.

LFDevRig1-Getting Started

LFDevRig2-ApplyToClothing

LFDevRig3-InjectMorphSupport (Instead of this, you can copy morphs from Dawn to the clothing later in the Pose Room)

LFDevRig4-TransferMorphs toClothing

LFDevRig5-EditingFBMs

LFDevRig6-EditingJCMs

LFDevRig7-EditingCompoundJCMs