These verses are describing the Lord's intervention in the affairs of humanity. The first part of the verse says "he saw that there was no man, and wondered that there was no intercessor," which implies that there was a need for someone to stand in the gap and intercede for the people.
The rest of the verse describes the Lord putting on righteousness as a breastplate and a helmet of salvation, and clothing himself with the garments of vengeance and a cloak of zeal. These are all metaphorical references to the Lord taking action to protect and defend His people and to bring justice to the world.
The "breastplate of righteousness" represents the righteousness and protection that the Lord provides for His people. The "helmet of salvation" represents the salvation and protection of the Lord's people. The "garments of vengeance" represent the Lord's justice and the punishment that He will bring upon those who have wronged His people. The "cloak of zeal" represents the Lord's fervent love and devotion to His people.
It is describing the Lord's intervention in the affairs of humanity. The verse speaks to the Lord's protection and defense of His people and His justice in the world. The Lord is depicted as putting on righteousness as a breastplate, a helmet of salvation, the garments of vengeance, and a cloak of zeal, which are all metaphorical references to the Lord taking action to bring justice to the world and to protect and defend His people.
Isaiah 59:16-17. He saw that there was no man, and wondered that there was no intercessor. Therefore his own arm brought salvation to him; and his righteousness sustained him. He put on righteousness as a breastplate, and a helmet of salvation on his head.