And what’s with the headbands? Almost every man in the picture is wearing a headband; they appear to be color-coded.
I don’t know. But if you remember Star Trek, the color shirt showed in what department you worked. Perhaps the headbands did the same.
Hard hats, color coded hard hats. Just like the Navy color codes the different vests for its flight-line personnel. they color coded the hardhats for management, electrical, hydraulic, etc.