It might be a suggestion but I don’t see how it’s the law
Governors have emergency powers that carry the force of law.
Businesses can stipulate any dress code they desire. “No shirt, no shoes, no service” for example. Most factories require safety glasses or shields when touring factory areas, and if you want inside a cleanroom you’ll have to put on a gown, booties, gloves, and a full head covering (ref. “Lurch in bunny suit pic”).
This is no different if Ford requires it. Wretched Gitmore should be given a jar of sand and a hammer.