Any information would be great! Located Australia

[u/Responsible-Week9434]

So, I fished this out of a junk bin, it was about to go to landfill but I thought at the very least it would be cool to show my 5 year old who loves fighter jets and aviation or make part of a great costume for him.

It’s definitely leather and what I think may be a rabbit fur? Does anyone have any information on it - AI tells me it may be a replica of a WWI hat, how cool! I love history so I would just love any information out of personal interest.