Sayyiduna Abdullah bin Amir bin Rabi'ah (may Allah be pleased with him) said: I saw Sayyiduna Uthman bin Affan (may Allah be pleased with him) at a place called al-Arj on a hot summer day, and while in ihram he had covered his face with a purple velvet cloth.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9086