Our pax in the north sea wear survival suites, re-breathers and most wear plb's (Personal Locater Beacons) The cabin is trimmed and lined and there are no sharp edges or corners. They are provided with "spongy" ear protection and in the a/c they also have ear defenders issued. The crew DO NOT get re-breathers or a lined cockpit. I asked for a re-breather years ago and was told were to get off. I have also asked to wear a helmet and was told that "The pax would complain". Twice I have hit my noggin on sharp objects while in turbulence and f&*k me does it hurt.
Some years ago the crews were instructed by "D Management" to wear safety glasses offshore while re-fueling and pairs of said glasses where place in the door trim of the a/c. NO ONE wears them. If D Management cared about its crew then it would issue modern light weight helmets to its crews.
I for one would have no problem wearing one. Mines a medium.