If I recall correctly ... it wasn't too long ago when a contender's posing trunks had to be brought to the weigh-in for approval.
And also .... the very first round when all the contestants made their first appearance on stage, was called the Relaxed Round which was strictly enforced with arms relaxed and held loosely by the side and feet together as in military formation .. and no flaring of the lats nor flexed abs .... front - side - back - other side.