Quote - - I don't think it's possible to remap V4 in a Material pose without causing the user some difficulties, is it?  Hmm..

That's correct. That mean's remapping and the new "right arm" have to go in the obj file as material group. Ok, using RTEncode or such the changed mesh could be distributed. But I think it's mostly worthless, even if some people would love such "corrected" uvmapped mesh, but normally no one will load a special V4 only for use of one outfit. And for other use it's senseless cause no existing texture map would fit to the right arm.

Quote - - You know, could it be possible to build two material settings for the arm within the same Material pose?  They don't actually share the exact same portion of the mapped textures after all.  The left and right arm textures are on different portions of the texture map, if I recall correctly.  One would just have a extra set of maps in it that over-rode one portion of the UV and a new, reversed, setting to switch orientations just on that certain portion of the UV?  So, for one part of the map it would go one way, and using a transmap on the other portion, the other material UV setting would be in the opposite orientation..   Do you think that is possible?

I'm knowing what you mean and first approach was to say yes. But with a second look the transparency channel could not help. Even there it's 2 pieces in the uv-map it's one material in the poser mat room. So the effect have to be split in the displacement channel. All except the displacement is direction independent.

I have asked Bagginbill for assistence to have a better lace on the left and right leg seams.
He has made a fine example for having a procedural texture on only a small part of the complete material area. In his example the special pattern runs along a line build by the fractal sum.

And now I'm fiddeling with the problem to have that pattern not run along somethere but exactly along a given line in the uv-map. If that works it should be combined with other material in the rest outside of that line.

But as you see it's the same problem as for the right arm. Each time we have a area to be taken from uv-map for one pattern and to be combined with a other pattern outside that area.
In one case we have leg seams and rest of the leg and in the other case we have right arm and rest of the body, here simply the left arm.

So it's not trivial ... might be only not for me. I'm on the way and hopeful nevertheless and if the one problem is solved the right arm should work the same manner. I would say "stay tuned ..."