You can do this with adamantine already.
While you can make metal clothing from adamantine, it wears down at the same rate as all other clothing, and is thus a terrible use of strands. I avoided using the word until now to prevent HFS spoilers.
The maximum defense for an adventure mode dwarf would involve clothing of adamantine, topped with leather, the adamantine chain, then adamantine plate. Then all 15 possible cloaks in adamantine. Crazy but true trivia.
But what I'm suggesting is a modification of the existing metal cloth clothing.
Oh. I thought you were suggesting new ways of making metal clothing out of, like, steel or something. Which would not be very wearable.
Just put "HFS SPOILERS BELOW" if you really want to spoil people... although honestly, I've never gotten why people are so determined to hide these things. Or you can use spoiler tags, for, say, saying things like this:
The very first thing I said, way back in one of the threads discussing the game before it was publically released, was to ask about Moria-style scenarios involving mithril and balrogs. It always struck me as similar to worrying about accidentally revealing that a fantasy game has dragons in it.