Having nearly been driven into by a couple of idiot yellowcoats due to the (rare in the UK) sun causing severe reflections in their vehicle windscreen, I agree that these arse-covering road diggers' coats can be a sodding nuisance - and a hazard.
Struggling into the flapping yellow abortions to walk twenty feet from aeroplane to control point is a nonsense, of course. I gather that's what is required at Kemble these days?
Now, if someone such as Pooleys or AFE was to come up with a smart, lightweight flying jacket in 'safety yellow', perhaps people would feel less annoyed at having to wear the stupid things.