1) Despite the name being "Forgotten Vanity" it's not an event about bringing back any vanities that already exist which is why it was funny seeing people suggest vanities.

2) Tabard set was actually gear from what I remember and not a vanity. But it's also discontinued so whether it qualifies or not is up in the air. Dark watch sword was discontinued but it was brought back in the first forgotten event as a vanity, so there's that.