Attached is the TNO Dustman Disguise Outfit Mod file for used with the Planescape Torment Mods guide found HERE.
This modification changes the Nameless One original animation to the one of Dustman Disguise. The changes are purely aesthetical and will not affect the game in any fashion. Also, just like the original disguise, any weapon bigger than a dagger will also appear to be a dagger. You do not need to restart the game in order to see it work.