This doesn't relate to factory work. However, up through the early 1990's in my work as a director/cinematographer, I did a few corporate films for Safeco Insurance. Sport coats, trousers and ties were frowned upon...it was suits and ties. And not just a dress shirt, it had to be a white shirt. And the tie had to be something like a regimental stripe one. On one shoot, I showed up with a blue dress shirt. The client took me aside and said that on the next day, we were interviewing the CFO and my shirt had better be white. It is likely still the same there.
Erich in Mukilteo
Erich in Mukilteo