Just a sad story to make you feel better (maybe). I've been looking for this chest for a while now.
So we're discussing my new 16 twink Rogue about a month or two back, and we start talking about our old twinks.
Note that I haven't told him I need a Gloomshroud yet, but I was already looking for one.
My friend logged into his old account, and he had a 21 Druid there.
He gets on it, and takes a look at his gear, because he was bragging about it being an old Feral twink.
he has the whole Defias set, except the chestpiece. I ask him what the chestpiece was.
As you can imagine, I almost had a heart attack. It was a Gloomshroud Armor. He thought I DC'd or something because I went dead silent for a good minute or two and had no idea why.
Tried multiple times to get it unbound, but because that character was so so old, it only resulted in multiple failures.
I stopped caring about the chest since I barely play WoW, but good luck! Hopefully you'll get yours soon!