Looking for a Korean War era Australian slouch hat

Hi! My dad served in Korea in the Army. He's 78 years old now. He was telling a friend recently that he had liked the Australians' hats and tried convince some of the Aussie soldiers to trade him one but couldn't get any takers. Apparently they had to pay for their own hats and weren't about to give them up lightly. I overheard the story and I'd really like to find a Korean era Australian slouch hat to give him. I've just started looking. Am hoping to find one thats in good enough shape to be wearable. Think that's possible? Anyone know where I might find one?

Thanks!

I have a few spare from my collection but all 60s to modern Im afraid. Did have a very very nice 50s dated RAAF one but sold it unfortunately.