I've gotten pretty used to PS6's tools while trying to edit the Powder Gangers outfit myself.
Removing the NCRCF letters from the coat and replacing it with just... the coat. And making it similarly textured. Pretty difficult, but doable. It's not perfect, and if you look real close, it's fairly obvious that some sloppy work was done.
Maybe after I changed the color to olive drab it would be less noticable.
I've messed with it ever since I posted this topic. Uninstalled the dds patch and reinstalled. It won't save properly

It's not a huge deal, really, I guess. I was actually gearing towards a 'Bill' from Left 4 Dead look.
That Powder Ganger outfit recolored (if you could remove the buttoned up shirt underneath the coat) + an NCR beret = Bill.