Note the picture of Hitler is captioned "Hitler and SS Guards" but those are army troops.
Boss did not design any uniforms. They made uniforms for the myriad Nazi organisations and followed standard patterns issued by the RZM, the official government standards office.
I am not sure if they made anything for the army on a big scale, they just were not a big enough company. They had gone bust only a few years earlier.
Most party officials or senior (commisioned) officers in the SS had an option of getting uniforms tailored from approved clothiers. But this would only be for what we called First Class or Mess Dress. Regular wear items would come from issue stocks. Only very senior officers would routinely wear tailored items.
Canada has similar policy. Forces, CBSA, CSC, Parks Canada all get stuff from Logistik, but it can be excellent or crap. They contract it all out.
You can get tailor made stuff but only from listed outfitters and it has to conform to regulation.
I just don't get the hate for Hugo Boss. There is no similar hate for Volkswagen, which was Hitler's pet project. Or Siemens and ICI, who used thousands of slave workers but are not as visible a brand. Maybe it is a class thing with Hugo Boss seen as elitist and therefore despicable?
Hijack over, sorry.