The Black Knights are able to fund the production of multi-billion dollar super mechs. A million suits wouldn't be much different.
Though I am surprised that the production of said suits wouldn't raise some suspicion, assuming they don't have an in-house textile department. Of course, once again, I expect that in a world like that the image of Zero would be a marketable product for dressing up, jokes, costume balls etc.
Or perhaps not... I don't remember them releasing Osama Bin Laden costumes back in 2001. Lets just say "lol plot" and move along.