I have a vague suspicion that it might have been mentioned in an old SCA publication, or maybe someone I worked Faire with a gazillion years ago told me about it, but I really don't know. In looking at the contemporary art, the only thing I can surmise is that someone interpreted the deep V neck of the ionar/jacket thing worn over the leine as a wrapover effect...maybe.
It just goes to show what a precarious field costume research is. I do my best to be accurate (and to tell people when I'm not), but I sometimes wonder, late at night, if some archeological or bibliographical find is going to come along that proves that my life's work is completely wrong.
Of course, I also find myself speculating on just how much I could abuse my authority, if I were ever to let my sense of humor loose. Hmmm....April Fool's Day is only 295 days away!