I said pure glass. I'm a supporter of the images shown being glass armor. By ceremonial, I mean it will be used by the upper echelons of the military. The grunts wont be wearing glass armor. It would be for Generals and such.
And to reaffirm the possibility of glass armor: "Glass weapons and armor are an ornate design: light and flexible, although very difficult to make and expensive. Glass armor is a lightweight armor created using rare metals studded with volcanic glass." - http://www.uesp.net/...mor#Glass_Armor
The armor we see is metal, studded with glass. I think we just confirmed the glass armor.
Yea, Ornate is the word you were looking for. Ceremonial implies that its impractical for actual warfare.
http://www.uesp.net/wiki/Lore:Falmer
and
http://www.uesp.net/wiki/Lore:Fall_of_the_Snow_Prince
Even though Stahlrim was used by the Nords for burial purposes, the skin of the Falmer would work well with the Ice armor. Being impervious to frost would help out while wearing ice armor. By being magic users, a medium armor would allow ample protection, while not hampering their movement.
EDIT: Even though they say that Stahlrim was reserved for the Nord's, Solstheim was inhabited by Falmer, and such they should have had access to it. Otherwise, I'd assume they were unarmored.
"His body would be preserved in the barrow for as long as the earth chose, but would not be offered the protection of
our Stalhrim, which was reserved for Nord dead alone."
You have the quote. Why would the Nords refer to it as "our" if the Falmer wore it themselves. It wouldn't have been an issue. Also, your last statement suggest that Stalhrim is the only material available on Solstheim to make armor from, and its not. Its may be even that the Nords had discovered how to shape the material into armor and weapons before the Falmer did, which would make sense from this account.
In any case, the Falmer have left little to no evidence of themselves, not even ruins or artifacts, just stories told from the perspective of other cultures. There is little anyone can say with confidence about them.