A Black desert shirt is an item of clothing that players may find useful when doing the Shadow of the Storm quest. They can make it by using black mushroom ink on a normal desert shirt. This can also be done with a desert robe to create a black desert robe.
The quest requires players to be wearing at least three black garments, in order to look evil. Players may already be wearing a desert shirt (since the main part of the quest takes place in the Kharidian Desert), and black mushrooms can be found locally.
This makes it a convenient choice to make the ink and use it to dye the shirt, though players will also need an empty vial and a pestle and mortar with them.
The black desert robes will not protect players from the desert heat effect. This is stated in a warning message shown when attempting to dye them.