Sash on the left???

[Tarheel]

My thoughts are based on the loyalty and allegiance display of an item. With a national anthem or pledge, the hand goes over the heart (for civilians). There would be different rules for military veterans.

This is your wife's tartan and her birth right to honor. I say sash on left shoulder (covering the heart) and pinned at the right hip.

I can see the Lord Lyon's logic being used for other circumstances not covered in this thread.