When I got in - 1973 --
We used a RED and WHITE flag -- that was intertwined.
They changed it to a yellow one a few years after that -- maybe one year.
Also the pylon was a RED flag -- on a spring.

Look at the movie - "Remember the Titans".
The hats the officials are wearing is ridiculous. I played during that time - and they NEVER wore hats like that.
They looked like they sewed the stripe shirt material on the hat. The stripes are REAL wide on the hat.
Then in one part of the movie -- the ref is seen wearing a solid white hat -- but other times - it's that stupid stripe one.