Annotated DC on Tumblr: In the promo for the upcoming Harley Quinn animated show, Harley and Ivy appear to be wearing uniforms with the Arkham Asylum...
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
Prison Jumpsuit Halloween Costume, Arkham Asylum, White Coveralls. Personalize Your Name. - Etsy
Arkham Asylum Inmate T-Shirt – AnimationShops
Prison Jumpsuit Halloween Costume,arkham Asylum, Black Coveralls. Personalize Your Name. - Etsy
Arkham Asylum Cosplay Costume Joker Prison Clothing Christmas Party Halloween Uniform Cosplay Costume Customize Any Size - AliExpress
Harley Quinn (Batman: Arkham Asylum) by Emily Baudelaire | ACParadise.com
Riddler Arkham Asylum uniform : r/TheBatmanFilm
Zach Franklin | Arkham Wiki | Fandom
Arkham Asylum Inmate uniform by tk8247 on DeviantArt
Batman - Arkham Asylum Uniform 3.5" Patch - SciFi Geeks