Jet black links of mithril interwoven with Star-metal. Feels like softish cloth. 

Advantage on creatures from the Far Realm and Creatures who have the Fiend type. 

Your steps make no sound, regardless of the surface you are moving across. You also have advantage on Dexterity (Stealth) checks that rely on moving silently. Wisdom (Perception) checks made to see you have disadvantage, and you have advantage on Dexterity (Stealth) checks made to hide. 

Don't look at me Xenpi

Notes: Advantage: Stealth, Bonus: Armor Class, anyone who wants to be sneaky, warm, and have a really protected neck.