As-Sa'ib 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.)  

أَنَّ رَسُولَ اللَّهِ ﷺ ظَاهَرَ يَوْمَ أُحُدٍ بَيْنَ دِرْعَيْنِ أَوْ لَبِسَ دِرْعَيْنِ