Ostensibly impervious to water / snow etc, they were remarkably absorbent ....and occupied a lot of space in a bog standard locker.
When they were removed from being issued, rather than inconvenience SCAF with paperwork, and taking up space, I kindly disposed of mine to a student in a "somewhat dubious" pub in Bangor called the Glanrafon....they were a fashion item for a while
The £20 came in useful.
When asked some years later as to where it was when leaving the RAF, I merely said it had been disposed of appropriately and surely the lady asking me was aware SCAF was prone to errors at times.
I got the impression madam wasn't entirely convinced