V4 has magnets built into the rigging, so when you bend arms and legs, wonky stuff is reduced. (This is an old approach to not having weight mapping.)

The V4 magnets can be extended to apply to conforming clothing.

This has absolutely nothing to do with offering nice ways to manipulate skirts.

It's so that, for example, when you bend her thigh, the pants don't pass through the thigh.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)