Wondrous Item, Very Rare, Requires Attunement
Nightingale Armor is a set of magical +3 Hardened Leather. (13+3+Dex AC)
While wearing Nightingale Armor, its black coloring and magical nature grants its wearer advantage on Dexterity (Stealth) checks made to hide. In dim light or darkness, any Wisdom (Perception) checks made to detect you have disadvantage.