The following is based on unverified behind the scenes information and has not been confirmed by canon sources.
The Silver Shroud bears a strong resemblance to 1930s pulp hero "The Shadow." Both characters are stealthy vigilantes with a mysterious demeanor, along with similar costumes, gleaming weaponry (The Shadow's M1911 pistols were named "Silver Heat" in the 1994 film reboot of the character), and catch phrases. The Shadow also has an analogue to Shroud's Mistress of Mystery in the form of his confidante, Margo Lane.
End of information based on unverified behind the scenes information.