Hi again:
I'm not certain how to edit clothing I've already made, so this might be the entirely wrong workflow, but I've encountered a problem.
I've loaded up the item of clothing onto a human in makehuman, then imported them both into blender using the blender addons. ie. load the makeclothes preset in makehuman 0.6.3 settings, then import human.
However if I immediately attempt to check the clothes I've just imported in they come back as having multiple vertex groups.
Is that how it is supposed to work?