I don't understand your point at all.
I'm not a dwarf? I don't get it.
I said that in almost all professions, goggles prevail over full face masks. This is because eyes are much, much more valuable than faces. Welding is unique because it has sparks flying at you; you have to cover your entire body with either fabric or mask. However, furnace operating is not. In modern times, steel furnace operators operate with a full body silvery heat-resistant suit to protect themselves. In dwarven times, dwarves being reckless and not having the technology to make such suits, they would likely only have goggles and very long sticks.
Then you said that if you had a full face mask, you would walk around with it on. I was confused by this, and did not understand what that had to do with anything. I interpreted this as, "I enjoy walking around with full face masks, so a furnace operator dwarf would walk around with a full face mask for fun". I said that you were not a dwarf; that is, you were unique. The average person does not purchase a welding mask and walk around with it, and there's no reason to think the average dwarf would. Besides, even if that were true, that would mean that random herb gatherers would walk around with full face masks and that's just ridiculous. Nobody would be able to tell them apart.
Anyway the main idea of a set is that you can tell dwarves apart better, and as Deon said, full face masks look too much like military. If you can make one that's distinct yet more attractive than the goggles, well, more power to you.