The skirt is actually quite short.  Here's an image showing what the skirt looks like when V4 is standing, and what it looks like sitting.

(please pardon the non-materials, and the default V4 skin... just a quick screenshot to show you what I'm talking about.)

As it's grouped now, all the cloth is grouped to her hip -- which seems to be the norm for skirts, though I won't profess to be an expert.  If I group portions of it to her thighs, the front part looks moderately better, but then the back part looks ridiculous because a line of cloth in the middle of her leg sticks out funny. 

I've tried adding another bone attached to the hip bone in the skirt, and while doing this DOES make the skirt bend when not conformed (and the x-rot value of the extra bone is adusted), it doesn't do anything when the skirt IS conformed, except make the parts of the skirt not embedded in V4's thighs stick WAY up in front.

I'm open to using handles... Have done so before when rigging wings... but adding extra bones only seems to be affecting the portions of the skirt NOT embedded in her legs.  And it's irritating the crap out of me, LOL!

Using magnets, again, doesn't seem to be affecting any portions of the skirt that are embedded in her legs.  It's like when the skirt is conformed, it simply refuses to budge from within her thighs.

I feel like I must be missing something obvious.

BTW, using Poser 7 &  V4.2, in case I didn't already mention that.

EDIT:  Forgot to add this...
If I use cloth simulation, I can obviously drape the skirt when she's sitting and generate an obj for use as a morph target.  However this morph does NOT work when the skirt is conformed to her.  Does exactly what adding another bone does... just makes the non-stuck parts of her skirt jut upward.  

The ONLY way I have gotten the sit morph to work is to NOT conform it to V4.  If I parent the skirt to her hip and use the cloth simulation morph OR the extra bone, then the skirt works in a sitting position. 

I just wonder how ANYONE gets conforming skirts to sit... I OWN at least a few... I'm mystified as to how it's done!  LOL.

Intel Core i7-8700 6-Core 3.2 GHz (4.6 GHz Turbo), 32GB RAM, two GeForce GTX 1080 Ti GPUs

DS 4.10, Photoshop CC and CS6, Poser 11 Pro, Vue 2016, CarraraPro 64bit, Autodesk Inventor, Mudbox, and 3DS Max

One in 68 children is diagnosed with autism.  One is mine. ♥