I think Lanthanum would probably be able to better answer the question than flannel since he is the one that made the stormtrooper armor. I will see if he has any ideas when he gets on TS.
Don’t get me wrong, flannel knows a lot but flannel hasn’t done any armor yet so I am not sure what all he knows about it.
That being said, I had this same issue last time I imported the latest version of the armor from Lanth. I’m not sure how or why it happened but most of the materials lost their references. IE: Base color, Normals and Specular were all blank. You might want to check into that. Also, I think DavidBC may be onto something with the attachment info’s.