Right, whether you wear your ribbons tied or not has nothing to do with whether you are married or single. That would seem to be an old wive's tale. Customarily, as Jock indicates, the ribbons are worn tied on a balmoral and untied on a glengarry.

Remember, the ribbons are the modern vestiges of the drawstring that was used to size many old broad bonnets, which would, of course, have been tied. (Regardless of one's marital status).