On the Wirral, by 1983 the management were making a serious effort to get train crews and shunters to use Hi-viz vests but the majority were resisting.
In the signalbox trying to get one was like trying to get hold of hen's teeth, they were that hard to get. We usually scrounged them off the Per Way as each box should have had one in the Pilotman's SLW envelope.
At the time the Hi-viz vests of the Per Way or S & T were hardly Hi Viz as they were normally covered in plate oil, flange grease, etc!