So how evil were they?
Most of the uniforms were made in what can be considered the forerunner to the modern day sweatshop, at times by Prisoners of War. Also, it's impossible to underestimate the importance of those uniforms to the whole Nazi image. To this day, they are essentially synonymous with "evil." The influence of the design has been widespread, especially in film where their influence has been noted in the outfits of the Imperial officers from Star Wars.
But, unlike the products of some other companies on this list, the uniforms weren't directly responsible for killing people. In fact, since they actually made the wearers uncomfortable and smelly for a quarter of the year, relative to the rest of the companies on this list Hugo Boss probably deserves a medal of some sort.