Herbalism Cape
Herbalism Cape is the mastery cape of Herbalism: only those who took that profession to level 100 wear it.
How to get it
Take Herbalism to level 100 and talk to Aunt Romina: they give you the quest Mastery: Herbalism, and turning it in grants the cape. It is the only way to get it.
Who can use it
Any class can equip it.