...is knowing you already looted the gear years ago and wore them for a full tier.
Because you have screenshots of yourself proudly wearing them.
But no, the game says you haven't unlocked those appearances, so good luck and have fun! And worst of all, some of them are from world bosses or LFR modes.
Sorry. Just had to get that off my chest. It's just so ... frustrating.
EDIT: The reason is I've finally made my up to Dragon Soul, and I've only just discovered what so many of you have endured for years: no loot, nothing but gold bags, Nightmare Spine... all for 0.2 chance for loot I KNOW I LOOTED YEARS AGO.