They taught us this in fencing as a side discussion (like during a break). Apparently it isn't true, as other commenters pointed out.
The button side of jackets thing is true though, except usually also told wrong. We're often taught in fencing that men's jackets button left over right so that a sword drawn by a right handed person doesn't fuck up your own clothing. That's also wrong, but close: men's jackets button left over right because you traditionally put your shielded side forward, your left side, and you wanted any armor pieces to overlap so that there's no holes to get caught in if you're poked from the left. Which is a stance backwards from later style one handed fencing. The not messing up clothes on the draw of a sword is just extra bonus from the original reason.
The button side of jackets thing is true though, except usually also told wrong. We're often taught in fencing that men's jackets button left over right so that a sword drawn by a right handed person doesn't fuck up your own clothing. That's also wrong, but close: men's jackets button left over right because you traditionally put your shielded side forward, your left side, and you wanted any armor pieces to overlap so that there's no holes to get caught in if you're poked from the left. Which is a stance backwards from later style one handed fencing. The not messing up clothes on the draw of a sword is just extra bonus from the original reason.