Instead of mucking around with the group tool with, the easiest thing to do for V4 is this:

1 - Go to the material editor room and paste bagginsbill's pantyhose texture dials to the hip group. 
2 - Assign the torso texture from your prefered character by changing the texture file to the correct torso file (not the limbs file).
3 - Fiddle with the dials and settings until you get the desired effect, then copy all of the settings to the leg and foot (or shin and others if you using something other than V4)
4 - Change the leg and foot textures from torso texture to the limbs texture for your prefered character.

Done!

The downside with this is that there is a bit of copying and pasting, but because the V4 torso and legs are on two different texture files, you would need to create at least two different pantyhose groups using the group tool anyway.

The upside (even using this approach for V3, A3, and The Girl) is that you can more easily assign the texture to specific groups (if you character is wearing high boots, you might not need to texture the foot and shin, for example).

The group tool gets complicated for V4 because the torso and limbs textures come together somewhere in the middle of the thigh group (see the bottom of the red wavy line in my above post from october 16th), so I avoid it if I can.  It looks like that is the trouble you are having with your textures.  You've made the groups, but you can't get the textures to match.
It's easier to do what I suggested above and build onto it if you need:

For high cut clothing (see my above posts from August 19th), you can build up some of the polygons from the abdomen to match the cut of your clothing, and assign those polygons to a new material like UpperPantyhose.  You'll just select the UpperPantyhose group in the material room and use the same settings as the hip, since it is part of the torso texture.  Pretty easy

The real test is when you have a swimsuit with high cut hips and a low cut back.  Then you're also going to need to create a new group deleting out the polygons that are poking above the back of your suit.  Messy, I know, but it will still be part of the torso texture.
It'll make sence once you play around with it a bit.

Hope that helps :)