Thank you for the clarification, strangetimes, and I absolutely apologize for offending you. As I said, I had never heard of the custom, so I was just reacting to the post that says it is about "bad luck." I assume you would agree that that would, by definition, be a superstition.
I am curious; what is the reason for or origin of the custom, if you know? And I hasten to add, even if you don't, that certainly doesn't mean it isn't a real custom. I happen to be performing in "Fiddler on the Roof" right now, and as I am sure you are aware, one of the first lines in the show is Tevye saying, regarding men's keeping their heads covered, "You may ask, 'How did this tradition get started?' I'll tell you: ... I don't know. But it's a tradition!"
Also, in your community, would it be okay for a non-Jewish female guest to wear an otherwise appropriate pants outfit to a funeral? I'm not sure what type of community you are in. I know that here, even at Chabad, where all the women wear long skirts and sleeves and wigs, non-Chabad women (including me) wear pants and even jeans to events like parties or speakers and nobody bats an eyelash.