OK. So, a cape would be, of course, a back accessory for armour. It would cover the entire back, and would come in all categories of colour.
Hallow, Milatary, and all the rest.
It would have a sort of glowing, silky tinge, and would certainty bright up your armour!
I know this is not a long post, but I hope it is good!

Please comment if you support my idea, or have any other ideas for it, as long as your comment is polite, and consists of no swearing!
Trymal