I'm sorry that this has been such a mess for you. We'll get to the bottom of it, however, it will still be the GML or GCO call for it.
@Raider maybe we can both chat with the GML or GCO or have him post on the GML/GWL forum for guidance as well.
Here is my stance on this costume: If I can see any resemblance of an object in the armor it is shiny enough for me. If it is really matte and all you see is a light source then it isn't shiny enough. If yours looks like Halycon then in our garrison I'd approve it.