Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Armor in a dream is a fortress against enemies and protection from affliction. Wearing it indicates gaining authority or a righteous brother to rely on.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Armor indicates an invincible man who protects his family. For a woman, it is a husband who protects her.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Armor is interpreted as security and salvation. Whoever sees himself wearing armor is safe from his fear.