1- In mythology, the breastplate was always considered to protect the knight. When we experience ourselves as wearing some form of protection around the heart, we arc usually protecting our right to love unconditionallv.
2- Psychologically we arc at our most vulnerable where matters of the heart are concerned, and most often need protection in that area.
To dream of someone else wearing a breastplate indicates their capacity to be hurl emotionally.
3- Our need to protect ourselves spiritually.... Ten Thousand Dream Dictionary