Sewn from Sin, the Succubus' Favored Cloak
A Seductress’ Robe with Intense Hidden Power.
You gain a +2 item bonus on all Diplomacy checks against an intelligent creature. This bonus increases to +5 if you are able to touch the opponent.
A successful Diplomacy check automatically improves an intelligent creature’s disposition towards you one stage. This effect does not stack with multiple Diplomacy checks.