Slid, if you dig into some of the icon threads it's explained there... you need to use icon first, and use the /benpc command (or something similar) to first appear as the NPC, and then save that NPC outfit via a tailor or a save command line in the chat box. Then I guess that, with a little registry hack, you can open it in Paragon Chat and slot it onto a toon.
but I don't know the specifics, just remembering what I read.