Robert Siodmak and the proto-giallo?

So, last night I re-watched Robert Siodmak's The Spiral Staircase—a stunning, gothic, Lewton-esque thriller with expressionistic undertones. I was struck by the number of ideas, here, that would later emerge in gialli—most obviously, how the identity of the killer is obscured using a fedora–raincoat–black gloves motif. Then there’s the red herrings and the use of the "Lewton Bus". And, lastly, the eyes in darkness—a device I think Argento would go on to use from time to time. Even geometry—the staircase itself—is something that finds echoes in giallo filone.

So, my question: are there any notable, earlier, examples of a similar fedora–gloves–raincoat device—particularly in a similar murder-mystery? Maybe in the context of an Edgar Wallace adaptation?

I believe Hitchcock's The Lodger features a similar motif, but not in a way that feels as giallo-esque as it does in The Spiral Staircase. Basically, what earlier titles could also be said to provide a template for the giallo filone?