I am undecided between strict euro knights and peasants.
Or a very diverse battle field cavemen, Zulu, Bandit, Mongol, Roman, Greek, English, Saxon, Viking, Norman, Peasant militia, Knights.
What would really improve the mod is a way of rewarding teams, clans and players for dressing in similar region gear say a gold bonus for every player that wears Persian gear or a an extra multi if 50% of a team are wearing 2 or more Nordic items for example. This might seem difficult to enforce but it might occasionally produce a 100 man battle between 50 Roman Soldiers and 50 Greek hoplites.
If you don't want to dress up you don't get the multiplier. This could genuinely increase the Mods mass appeal imagine discovering this mod and witnessing a massive themed battle as a new player as opposed to the hilarious fail armies and mercenaries that we witness every day.