jawohl
Though he claimed in a 1934/1935 advertising that he had been a "supplier for Nazi uniforms since 1924", such supplies are probable since 1928/1929 and certain since 1934, when he became an Reichszeugmeisterei-licensed (official) supplier of uniforms to the Sturmabteilung, Schutzstaffel, Hitler Youth, National Socialist Motor Corps, and other party organizations. To meet demand in later years of the war, Boss used about 30 to 40 prisoners of war and about 150 forced laborers, from the Baltic States, Belgium, France, Italy, Austria, Poland, Czechoslovakia, and the Soviet Union. According to German historian Henning Kober, the company managers were "avowed nazis", "the Boss were all great admirers of Adolf Hitler", and Hugo Boss had in 1945 in his apartment a photograph of himself with Hitler taken in the latter's Obersalzberg retreat.
from Das Wikipedia