The uniforms and insignia of the Schutzstaffel were paramilitary ranks and uniforms used by the SS between 1925 and 1945 to differentiate that organization from the regular German armed forces, the German state, and the Nazi Party.
While different uniforms existed for the SS over time, the all black SS uniform is the most well known. The black-white-red colour scheme was characteristic of the German Empire, and was later adopted by the Nazi Party. Further, black was popular with fascist movements: a black uniform was introduced by the blackshirts in Italy before the creation of the SS. There was a traditional reason, as well. Just as the Prussian kings' and emperors' life-guard cavalry (Leibhusaren) had worn black uniforms with skull-and-crossbones badges, so would the Führer's bodyguard unit. These SS uniforms were tailored to project authority and foster fear. As Himmler put it, "I know there are many people who fall ill when they see this black uniform; we understand that and don't expect that we will be loved by many people."
During the war, the German clothing factory that eventually became the international menswear powerhouse Hugo Boss produced thousands of SS and other uniforms; with the black SS uniform having been designed by Karl Diebitsch and Walter Heck.
Once the war began, the black uniform was seldom worn. The combat units of the SS-Verfügungstruppe (SS-VT) and the later Waffen-SS wore a variation of the field-grey (grey-green) (feldgrau) army (Heer) uniform with SS insignia. The majority of SS personnel wore a variation of the Waffen-SS uniform or the grey-green SS service tunic. Branches with personnel that normally would wear civilian attire in the Reich (such as the Gestapo and Kripo) were issued grey-green SS uniforms in occupied territory to avoid being mistaken for civilians.