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"Although Hugo Boss claimed, in a 1934/1935 advertisement, that he had been a creator of Nazi uniforms since 1924, he became an official supplier in 1928–1929. The company makes uniforms for SA (Sturmabteilung, a Nazi paramilitary organization that played an essential role in the rise to power of Hitler in the 1920s, nicknamed “Brownshirts”), SS (Schutzstaffel, the armed arm of the National Socialist Party), Hitlerjügend (Youth Hitlerism), NSKK (Nationalsozialistisches Kraftfahrkorps — Nazi Motorized Division) and other "
"Historians note that in order to cover the demands for uniforms from the last years of war, Boss used the work of about 40 prisoners and about 150 slaves from the Baltic states, Belgium, France, Austria, Poland, and the USSR. The same sources note that the directors of the company were in love with Nazism and that Hugo Boss had in his apartment, in 1945, a photograph of him with Hitler."
https://historyofyesterday.com/hugo-boss-hitlers-tailor-6fe599f9cb1f?gi=f5b33d480c49