In Sibley's Official Move Guide Ann Maskrey says
"At the White Council, Galadriel wears a coat in shot silk, woven with a metallic thread that magically catches the light. I originally drew the coat as if it were blowing in the wind, hoping that it would create an ethereal, enigmatic vision of Galadriel...Beneath the coat, Galadriel wears a chiffon dress covered in rivulets of Swarovksi crystals that look like running water over another shimmering layer of beaded chiffon..."
When we saw this gown in V-log 3(?) it is clearly a soft mink or light gold metallic material that glistens under full light, as can be seen in the link you gave and this closer one:
http://4.bp.blogspot.com/...1600/galadriel02.jpg however in a lot of the published images the metallic sheen is just not coming across at all...
There is large picture, based on this one,
http://imgc.allpostersimages.com/...rdboard-stand-up.jpg in the Visual Guide, and the material just looks like taupe coloured linen - awful!! I don't think this is what Ann Maskrey really wanted!!