Klyros use seaweed and similar materials for dye, so their clothes are colored appropriately. The only metal is banded around their arms and feet. Nilrem, that space between the wings is actually part of the wings - the Klyros model has no "back" to speak of, so if we were to cover that up somehow it would require a whole new armor piece - one that would leave the rest of the wings untouched, and that is not something we're able to do at the moment :}
(http://img375.imageshack.us/img375/7629/klyrosmleather7cy.th.jpg) (http://img375.imageshack.us/my.php?image=klyrosmleather7cy.jpg)