Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ibnmajah:2806Hishām b. ʿAmmār > Sufyān b. ʿUyaynah > Yazīd b. Khuṣayfah > al-Sāʾib b. Yazīd Taʿālá

It was narrated from Sa’ib bin Yazid, if Allah wills, that the Prophet ﷺ wore two coats of mail on the Day of Uhud, one over the other.  

ابن ماجة:٢٨٠٦حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ عَنْ يَزِيدَ بْنِ خُصَيْفَةَ عَنِ السَّائِبِ بْنِ يَزِيدَ إِنْ شَاءَ اللَّهُ تَعَالَى

أَنَّ النَّبِيَّ ﷺ يَوْمَ أُحُدٍ أَخَذَ دِرْعَيْنِ كَأَنَّهُ ظَاهَرَ بَيْنَهُمَا