Well the Paris shooters and other responsible for attacks in France typically have a background petty criminality/not integrated in society as a whole but not in their Muslim community either. ISIS members in Iraq and European attackers have quite different backgrounds.
At their price point I assume they might not even deal with multiple factories themselves but maybe with some main one that produces some pieces then dispatches others to various smaller outfits. In other words same as everyone else.
I'm with you, that kind of "stylish kids" bullshit is prevalent now and this is where this comes from. I mean I sometimes had to wear suits when I was a kid but that was for special events, if you're 6 you want to wear a roman legionnaire outfit not some stupid cashmere sweater.