Narrated as-Saib ibn Yazid: as-Saib reported on the authority of a man whom he named: The Messenger of Allah ﷺ put on two coats of mail during the battle of Uhud as a double protection. (The narrator is doubtful about the word zahara or labisa. )
Related hadith on this topic
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
Life and death are in the hands of Allah.
However, for the purpose of protection, carrying weapons and wearing armor, etc., is legislated.
And this is not contrary to tawakkul (reliance upon Allah).
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2590