Abd al-Rahman bin al-Qasim narrates from his father that Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) had a silk shirt which he used to wear beneath his clothes. Sayyiduna Umar (may Allah be pleased with him) asked: What is this? He said: I wore it in the presence of one who was better than you.
This hadith is munqati' (its chain is broken).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6079