Green Cap

The Green Cap is a vanity item equipped in the social helmet slot.

The Green Cap is a drop from killing the guide named 'Andrew'. (Names are chosen at random from a list when the Guide spawns.)

Trivia
The Green Cap drop from only the Guide named 'Andrew' is a reference to the lead programmer of Terraria, Andrew Spinks. His sprite comprises of a player with the aforementioned cap.

It can be dyed like all other armors and vanity items and the green in the name can there by be "false"