Lots of things have a material called Preview. I don't understand what Preview is, except that it seems to show up in the document window but not in renders. Be sure that you're not setting the Preview color, because setting it is pointless and confusing (as far as I know). Also, you have a texture map attacked to the jacket. Do you want it? The pink is going to interact with the texture map. If you just want pink only, disconnect the texture. If, however, you want to use a texture map, then you want Diffuse set to white so the map renders as-is. Otherwise, the diffuse color alters the texture map (which, in some cases, you may want to do to alter the tone of the texture map).