The Sorrows outfit consists of a simple loincloth for males, with an additional sports bra-style top for females. It is decorated with necklaces and has bands on one ankle and upper arm.
Zion Canyon - Worn by some members of the Sorrows tribe. Openly killing a Sorrows tribal to acquire the outfit will immediately fail all associated quests in Zion and initiate Chaos in Zion. An undetected sneak attack will not affect any quests.
Three Marys - This armor, along with a Dead Horses stalker armor, may be found at the White Legs camp. Directly under the map marker the river flows around a small island, on which two slain tribals are lying - a Dead Horse and a Sorrow. The Sorrow will be wearing either this outfit or a Sorrows adorned outfit. Their armor can be taken without penalty or risk of failing any quests.
Their appearance is triggered by your first meeting with Joshua Graham in the Angel cave. Traveling to Three Marys after this should cause the bodies to spawn.
During Crush the White Legs several Sorrows may die during the quest, therefore making it easier to acquire the outfit without having to reverse-pickpocket or resorting to assassination.