Through 1978 all NFL officials wore white hats. Then, from 1979 to 1987 the referee wore a black hat and the rest of the officials wore white hats. This was done so the R could be more visible to the folks on TV.
During this entire time at the college level the referee wore a white hat and the rest of the crew wore black hats.
Then in 1988 the NFL switched and had the referee start wearing a white hat and the rest of the crew wore black hats. My guess is the NFL and NCAA wanted to be more uniform on hat color.
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