This thread, or part of it at least has been overtaken by circumstances. My employer insists that the cap is worn as part of the uniform – but this stipulation only applies to male pilots. Our female colleagues do not have to wear headgear. The law changed earlier this year with the effect that this policy is now considered discriminatory and hence unlawful. This may seem trivial to most (and in the grand scheme of things it is) but for those of us who hate headgear it is a relief. I can now leave my cap at home with impunity.