Step 1: Edit>Convert Figure to Prop
Not sure if this is really necessary, but I do it anyway
Step 2: Tool Settings>Geometry Editor
Geometry Selection>Select All
Geometry Assignment>Assign to FaceGroup (whichever you want; all that matters is that they are in the same group)
Step 3: Export>To obj
I start with the default Poser export settings, but then I:
a) Check the "Use Bone Welds" box
b) Uncheck the "Write Groups" box
Step 4: Edit in Blender (only sometimes)
If parts of a garment are modelled as separate meshes, I use the "Edge Select>Loop" tool in Blender to select the edge loops that are closest together, then the "Bridge Edge Loops" tool to join them together. Then I assign the new faces to a surface group.
Step 5: Re-import into Studio
Step 6: Drape Cloth...
View media item 1933
The girl's dress was draped using this process and DynCreator for DAZ Studio.