Earth-1 Robin at the start of Crisis on Infinite Earths was the first Jason Todd. He was much shorter than Batman, wore green sleeves, had those twin curls on his forehead, and used a domino mask that seemed to stay on by magic.
I know what you're saying about the Earth-2 Robin having different headgear in other stories of the decade. But in Crisis on Infinite Earths he's recognizable for long red sleeves, parted hair, and a mask that goes all the way across his face.