At various times in DC Comics history, the Joker has donned his own version of the Batsuit; from cosplaying as Batman, to Dark Multiverse versions of Bruce Wayne who became the "Batman Who Laughs." ...

“Robin, started with the cannibalized stunt bat suit ... before Batman v. Superman. “In my mind, it was that Robin had died 10 years earlier, during some run-in with a young Joker ...