To underscore, I would bet that washing hands frequently, wearing gloves when touching food and masks/hood when working near food is much more important than the difference between wearing a fresh white-collar shirt vs a sweat shirt you change every other day.
That is vastly more important. It is mandatory to wash your hands before visiting production as well as changing clothes. Regardless of how clean they look, they will contain foreign matter. The cafeteria is pretty much declared a hazard zone, not only because of that one colleague who has a weird cheese experiment going on in the fridge.
Downside for management is that we are only allowed to drink water in our offices and are not allowed to eat outside the cafeteria. With time I have grown to like it that way, even if I am a coffee junkie. But it never smells bad in the office in exchange.
There is still some strange association with cleanliness and neat shirts.
