Guild Wars 2

Among others the wardrobe shows the Black Earth Aquabreather skins. However, none of them can be obtained anywhere near the Black Earth mine (anymore). The only other place (known to me) to get those special aquabreather skins is Orsippus in Frostgorge Sound.
Unfortunately a long time ago the light aquabreather skin from that karma trader was replaced with the standard skin (which cost me a transmutation crystal for nothing since I had transmuted that skin to the level 80 aquabreather).
For that reason you can only obtain the medium and heavy versions of the Black Earth Aquabreather, the light version does not exist anywhere in the game.

Unlocking the medium/heavy skin should unlock it for the light skin.

I am pretty sure if you check the other Aquabreather threads, someone found a merchant that sells all versions that are unlockable.