Misleading title – polygroups, if you don’t know Zbrush – is just a way to help organize sections of your model. Combined with the polyframe viewing mode, sometimes you get interesting renders.
In this case, the model looks much more complicated than it really is. What’s more interesting is how easily the model is to manage at this point because of the way it’s organized now.
Panels of cloth, separate details, smaller parts and larger section all get a group. After this, I can get started on the base for the print.
Be sure to look for “Stained” by David Baron in your LCS, or on Comixology.