Shadow Tunic

is a type of Clothing that is worn in the Coat slot. It is received as part of a set together with in exchange for giving an Orange to the Torch Dragon Merchant. They provide the highest possible Temperature Tolerances of any type of Clothing, and breakthroughs 1 Skill Level of SpellSettings\Modifiers\Modifier_Tool.xml. 
The item is gender-locked to only male charactersSettings\ThingDef\Item\Item_Equipment_Clothes.xml, which makes it less useful as Sub-Spirit Gear unless the sect is intentionally made single-gender. Specter Tunic is the identical female version of the item.
==References==