Generally if something can't be used as a merchant resource that means it can't be redistributed as a freebie also. To compound this, if something is permitted as a merchant resource that means the derivatives are intended for sale items only. Not freebies.

It's pretty clear that the objs involved with LF and LF pro may not be redistributed under any conditions. However if you were to retopo said objs, the original Geometries no longer exist for redistribution or extraction from a product of those Geometries. If you are unfamiliar retopology, whether manually or via an automation, you would want to find a unrestricted freebie quicksuit and utilize that as a springboard for content creation. I haven't seen any. If the target is a commercial product there are Merchant Resource meshes, notably a Body Suit by Afrodite Ohki available in the marketplace, that may be utilized as a MR for commercial products... not freebies. Unfortunately the mesh isn't contiguous with the feet.

I use Zbrush, or Mudbox for autoretoplogy. For manual retopolgy I use Retopoflow in Blender, a paid add on. There is a free auto retopo solution called instant meshes that actually isn't bad. It has edgeflow guide drawing features. Generally you want to retopo a high resolution mesh down to a lower poly count that's workable. You'll get better results. Generally.

So what does all of this mean? It means that unless you retopo your stockings, and redo the process of grouping, uv mapping, etc etc, they are for personal use only.

Example of retopo process using Blender and Mudbox I posted a few months ago...

LF Retopo