Liz, 1760 is a little late. "Dress in Anglo-Saxon England" by Gale Owen-Crocker shows a photograph of a pair of woven trousers dated to the 2nd century AD, recovered from a peat bog in Germany.
Anyhow, I'm not debating the fact that men have worn long flowing garments at different periods in history. I'm taking issue with the assertion that "most men have worn skirts in most societies for most of history." I think that's just too broad of a statement, especially considering that a good deal of human history has yet to be documented.
Also, in societies & historical periods where men do wear dress-like garments, men's clothes are still distinctive from women's clothes. Like McGrath said, cross-dressing has more to do with actually trying to look like a member of the opposite sex.
Although, really, what's the harm in that? *shrug*