Baron Kurtz said:There are also stories of military types drawing their swords (worn on left). If the jacket was buttoned right over left, the opening could impede the drawing of the sword - the hilt would get caught under the flap and the right-over-left buttoner would be slaughtered mercilessly by his reverse-buttoning opponent.
Most likely apocryphal . . .
bk
So, then it would be an evolutionary development. Survival of the fittest jacket werer.
Or some intelligent tailor may have just thought of it from the start.