As I remember it would have been some time in the late seventies. Safety concerns had been expressed and the 4 x 2 fire fighting system introduced, people became more concerned with personal safety and the use of proban overalls and balaclavas increased. At first they were not universally orange, my first set were a natty dark blue with light blue racing stripe! Some people got hold of second hand drivers overalls.
I think the first set of orange I saw was a chap who had marshalled at the Monaco grand prix, the organisers gave all the marshals a set. I think orange was settled on to avoid confusion with a) flags and b)drivers.
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