Having nearly had some yellow vest wearing prat in a car drive into me whilst I was driving on the aerodrome manoeuvring area - because the reflections on his windscreen prevented him seeing me properly - I consider that all vehicle drivers should be banned from wearing the stupid things whilst in the cab of a moving vehicle!
..it's not airside body armour, it's an insurance palliative for aerodrome operators.
Is it just a UK thing? No-one seemes to bother in France...