When you get more comfortable with your modeler (Hexagon I guess), you might end up just dispensing with trying to create groups automatically.  I group stuff by hand now myself.  In many of cases it's just a lot cleaner, e.g. when you have part of the garment near a border between body parts - like around the neck is a common place.  Many times an auto-grouper will break up that area into a very messy set of groups that won't bend as smoothly as a single "chest" group might.

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