Probably just part of their standard uniform. If you have to wear a uniform for school or work, you eventually get used to wearing it regardless of whether you like it or even if it serves any meaningful purpose.
When I was in chemistry class in college, we always had to wear safety goggles even when the chemicals we were working with were not corrosive or flammable or toxic in any way. I guess that got us used to wearing them when we did an experiment with sulfuric acid during the last week of class.
Caption this Meme
