When I think of Christmas ornaments, I think of a tree adorned with ornaments. The tree is improved.
When I think of virtues, I think of high integrity or character adorned with virtues (prudence, courage, temperance, justice, etc…). Your integrity or character is improved.
Virtues are habits you practice to improve your integrity or character.
Magnanimity is a virtue. It means to urgently do great things in all pillars of your life (spouse, parent, business colleague, community member and spirituality) with as much speed and frequency as possible.
Magnanimity is called the ‘ornament of all virtues’ because you improve your practice of all other virtues when you also practice magnanimity.