seen your mesh, julius.
seems you did a good uv map start. Dont get messed with word "shaders".Is much of a maya, or cg terminology...
here you want actually materials and textures.
I havent yet plaied with luke's plugin, but usually bone and weights plugins in blender, need mainly materials, and mostly UV image maps applied...
I think you already have 4 materials... here, a trick :
first, select the object (get out of pose mode, get into "object" mode)
the heck. A video. is faster

(note u can set use cursor as center of world rotation so blender becomes waaaay easier tohandle, just have a look)
(also, pay attention: RMB button is blue rings, and wehn u see red rings, is left button...tho I dunno if I have set it as usual blender is, as u can change it now in prefs, and I do often (I swap functionality))