Old style clothing layers have not really been used by most forna while. Its generally some sort of Mesh with its own texture, that matches the body.
For the most part, the common bodies (Legacy, Lara, Reborn for women, not sure for men honestly) have plenty of options.
That said, BOM does allow the use of old clothing and textures.
The Bofy and head are basically a "layer" over the basic Ruth/Roth that has a smoother and better look. Like people wearing prim/flexi/mesh hair. BOM will essentially just take whenever texture skin/clothing is on the Ruth/Roth basic avatar, and paint it onto the new body/face. It will probably look dodgy though, since old textures tend to be kind of low rez, plus its literally painted on.
Then the mesh clothing goes on the outside.
I would say, start with whatever you have now, and add one of library bodies, maybe a library head. See how it looks with whatever clothes/tattoos/skin you have now. Then maybe update the skin. I imagine there are green skins out there because there are plenry of furry/scaly folks who would use such a thing as a base.
You could also possibky find a regular human skin that can be modified, and add a green tint.
I am not positive how well it would work, but possibly also a slightly transpent green texture, worn as a tattoo, that still shows skin detail through, may work.
I don't know if any of this is helpful or what you are looking for.