The item Gaea’s Tunic (item=14277)
…which I apparently cannot link to because of some forum red tape…
…has some really weird graphical glitch where both the character’s shirt bottom and navel are duplicated at the player’s crotch line.
You can see it on Wowhead by clicking the big red “View in 3D” button, although you may have to spin the 3D model to truly appreciate the weirdness. Easier to see on female characters, since they wear briefs instead of boxers. Of course it’s also visible in-game as well, especially on the character-select screen.
The Wowhead page doesn’t have any comments about it, so I guess it’s a new bug?