Flak Helmet Liner?

[Mavrick56]

I've collected helmets for quite a few years and recently came across this item from a private party. He stated it had been in his family for many years and was always told it was a flak helmet liner. I've done all the research I can and never found anything like it.
It is cloth or canvas with leather straps. Chin strap is missing.
Please excuse the photos.......since I'm not sure exactly which way it was worn I've included photos of both, buckles in front and back.
Sure would appreciate any help offered.
Mavrick56

[ErWeSa]

I had hoped somebody would recognize this piece. Did some research, yet to no avail. I'm not even sure this is some kind of headgear. Perphaps we'll never know.