The Headplay had a white shirt and blue tie.
The DafToys is a real mish-mash. You'd have to change the shirt for Begins, take the sweater off and change the shoes for Dark Knight, or just put the straitjacket on and cover up the inconsistencies.
I might remove the sweater and straitjacket to have him closer to Dark Knight, and give the maggoty head to the Headplay.
Yeah, he's ready to go for straitjacket look basically -- since you never really see the tie.
But standard BB or standard TDK will require getting some other parts as you said.
Truthfully, isn't the suit a little gray for TDK...? Seems Scarecrow suit was more blue in that scene to contrast with the dirty brown/tans of the shirt/tie/mask.