I got offered one when I joined my (now) old company. Took it for a laugh. Apart from in a drunken moment at home giving everyone a few chuckles, I've never actually worn it. Makes me look like a stripper - and this has been agreed by crew when I put a hat on on a course once!
The problem is, the hats that most companies dish out are designed for men. If they designed a decent one for women, some might wear it. I wouldn't - it would mess up my hair!!