Beat you to it - as a result of basically this same discussion on the AA 6 years ago I think:
http://www.historiccombat.org/in_modo.html
fter three decades of researching and recreating "knightly" foot combat within the context of SCA tournaments, our understanding of how tournaments on foot were held has widened considerably. There is a greater general understanding about what armour was worn, the weapons that were usually employed and the appearance of noble combatants on the field than ever before. Today it is possible to go to many tournaments and observe combatants in highly accurate recreations of arms and armour of a particular time period. Dedicated individuals have driven this movement, finding that, to them, combat in more historical armour is both more enjoyable and more fulfilling, while benefiting all who attend our tourneys by deepening the medieval experience.
Over the past decade, we have also found many ways in which our actual combats can be safely brought closer to the experiences of noble knights and squires we seek to emulate. Whether through such conventions as counted blows(1), armour as worn(2), or others, many of our combatants have found that combat in a more historical manner is more satisfying and enjoyable to them. The difficulty has been that unlike historical armour, historical combat must of needs be a shared experience, and finding an opponent of the same mind is often a greater challenge than the bout itself.
We ask that those who would like to indicate their willingness to fight in a more historical fashion, wear the motto, "In modo antiquo," (In the ancient manner) visibly on their person, so that any seeing you may know your desire to fight in a more historical fashion.
We ask that any who would wear this motto abide by the following items:
To always fight with honor and without rancor.
To judge whether it is necessary to ask the permission of the sponsor of the tourney to fight with different rules, and if it is necessary, to request for permission from the sponsor, and abide by their decision.
To come to clear agreement with my opponent on the rules that will be used in the bout.
To inform the marshal observing the bout of the rules to be used.
To declare, or cause to be declared, the rules of the bout to the crowd attending.
To never wear the motto in such a way as to appear to claim rank or title which have not been earned.
We shall call all those who choose to display our motto our comrades, and together endeavor to strive for excellence in the honorable and ancient skills of arms.
(Any who wish to display the motto need only abide by items.