I don't think so. There are one or two pants that are moddable, light armour, and non-social items, if I remember correctly. I'll try to remember to get the info on them when I get onto the game tonight. Assuming I'm not completely mis-remembering things, of course.
Why are you excluding social armor? They're all light armor and moddable, and they provide a wide variety of pants. There must be 9 or 10 social sets with pants.