One of the keys to a Peace Tie is that it CANNOT be drawn with the Peace Tie on, not by you, and not by that druken brute of a mundane we have all heard about, every Faire seeme to have one.
One has to not only make sure that the weaon will not leave the scabbard, but also that the scabbarded weapon cannot be pulled out of the frog, or off the belt. It would be embarissing to have to chase a person down through the Shire after then not only get your weapon, but the scabbard for it as well. With swords, a heavy duty zip-tie around the handle, just above the pommel (or hand guard), then down and through the belt loop in the frog works well. It can then be covered/camoflaged with a strip of leather, fabric, etc. Just remember that Staff will most likely want to see the Peace Tie, so be able to move whatever you use to disguise it for examination.