Rewatching Sherlock Holmes and the Secret Weapon. Holmes's Rum Singh disguise looks like a roughed-up Holmes in sailor's garb. However, it takes in one of Rum Singh's acquaintances, which means that there's a criminal out there that looks almost exactly like Holmes.
Lestrade: The game's up!
Criminal A: How did you-
Lestrade: Oh, it wasn't difficult. I noticed Mr. Holmes here--gestures to Rum Singh--and figured he had caught on to something!
Criminals glare at Rum Singh.
Rum Singh: You filthy liar!
...
Rum Singh: Goes to sit down at a table in prison. Other inmates quiet down and shoot suspicious glares at him. I'M NOT HOLMES!
...
Jack Brady: We found him, Professor, just like you asked!
Moriarty: Ah, Holmes. Finally--pulls bag of Rum Singh's head--But this isn't...You fools! This is not Holmes! You've captured his stunt double!