If you're using V4 and want pantyhose, then aren't V4's detault groups okay to use as-is?

The attached picture is BB's stockings shader applied to:
2_SkinHip
3_SkinFoot
3_SkinLeg
3_Toenail
Without creating any new material groups. The groups with 3 prefix take the limbs texture; the one with 2 takes the torso texture.

If you're using a figure that has fewer convenient zones already set up, then creating new ones for the pantyhose or stockings is necessary, but with default V4 zones pantyhose is just about done for you already. Or perhaps I've missed what you were trying to do?