Ansett had them
I joined Ansett in 1964 and I had to wear those horrible white hats from 1964 until 1974 ( ? ) but luckily Ansett got rid of them. I think ANA had the white hats for many years before my join date of 1964
They were terribly hard to keep clean and faded badly in the sunlight .
The ones we had were made of some type of plastic top and were very hot in the sun in spite of being white.
Would be better suited on a pastry cook IMHOP.
The rest of the uniform looks quite OK.
The hat - RS