The artwork file name shows it as leather made.
There's only one armour for klyros, and is a light one, as they cannot wear heavy armours.
Perhaps the blueish colour of the armour lead you to think of it as metallic, but it isn't it even has little details of tied parts.
BTW, one thing I noticed, is that the space between wings is left without armour... and I always wondered how klyros manage to put on them the clothing, with the wings and stuff... do they require someone to "dress" them?
