After the feature patch
I am pretty sure they all together got, rid of it. Hopefully Anet adds it back in.
After the feature patch it’s possible to create camouflaged toons like this one and do unexpected things
if you had the armour unlocked in your pvp locker just go to heart of the mists and it should pop up on the right of your screen. if you are sure you had it unlocked but it doesn’t show up the first time you go into the heart of the mists, exit the heart then go back in again. It should work then. If not try, relogging and doing that again.
It was removed. Don’t worry they will “hear our feedback” and reintroduce it “soon”, for only 1200 gems!