It's kind of funky, but you have to basically create two groups, one for the lower legs, and another for the upper legs/hip and assign them as lower pantyhose and upper pantyhose respectively. I created two material groups called upph and loph  Then when you go to the material room, assign the "upph" group the torso texture, and the "loph" group the limb texture.  The trick when creating the groups is to make sure you have the correct polygons.  Use my picture as a guideline.  The line is kind of wavy, so don't try to make it a straight line.