WarnerBros.co.uk | The complete gaming history of Harley Quinn | Articles
In Batman: Arkham City (2011), you can find Harley Quinn's outfit from Batman: Arkham Asylum (2009) in Joker's Fun House, complete with Warden Sharp's ID tag. : r/GamingDetails
Official Harley Quinn Arkham City costume | Funidelia
The best Harley Quinn costumes: from Suicide Squad to Arkham Asylum
Official Harley Quinn Arkham City costume | Funidelia