Thanks again, all. The equipment is in place in the slots, so I guess he's okay. It never occured to me that his appearance wouldn't change. I thought I saw a Khem in a crowd on the Imperial Fleet wearing heavy black armor. I must have been mistaken.
Much to learn still, have I. Urrgghh.
you probably did see him wearing that. khem and a couple other companions in the game only have their equipment appearance change when you put on a companion customization