Pulp Figures: "Yet More Gestapo Previews"

Great if you come out with a full set of civilian dressed GESTAPO like the one in the set pwm31

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This guy, with the luger and briefcase is the perfect example of what people think of as the Secret State Police.

Maybe a couple in later uniform with side cap
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A couple with pistols -- lugers and walthers, plus some underlings (Kriminaloberassistent) with the Erma. These would really round out the rest of the gestapo-SS range

Wikipedia on Gestapo "Uniforms"
Before their 1939 amalgamation into the RSHA, the Gestapo and Kripo were plainclothes police agencies and had no uniforms. Although individual Gestapo officers could and did join the Allgemeine-SS or other Party organizations, those uniforms would not have been worn on duty.
Grey SS service uniform. RSHA personnel did not wear the "SS" collar runes depicted here (pic cited above).

From June 1936 a concerted effort was made to recruit policemen of the SiPo into the SS, and SS members into the Kripo and especially the Gestapo. With the formation of RSHA in September 1939, Gestapo officers who were also SS members began to wear the wartime grey SS uniform when on duty in the Hauptamt or regional headquarters (Abschnitte). Hollywood notwithstanding, after 1939 the sinister black uniform was only worn by Allgemeine-SS reservists; it was abolished in 1942. Outside the main offices Gestapo agents continued to wear civilian suits in keeping with the secret, plainclothes nature of their work.

There were in fact very strict protocols protecting the identity of Gestapo field personnel. In most cases, when asked for identification, an operative was only required to present his warrant disc. This identified the operative as Gestapo without revealing personal identity and agents, except when ordered to do so by an authorized official, were not required to show picture identification, something all non-Gestapo people were expected to do.

Beginning in 1940 the grey SS uniform was worn by Gestapo in occupied countries, even those who were not actually SS members, because agents in civilian clothes had been shot by members of the Wehrmacht thinking that they were partisans.