Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates from his father Sayyiduna Umar (may Allah be pleased with him) that he used to forbid dyeing 'asb cloth with urine. The suits (hullahs) that were made for the Companions (may Allah be pleased with them) cost a thousand dirhams or even more.
The Shaykh said: The suit (hullah) that the Companions (may Allah be pleased with them) wore consisted of two garments, a lower wrap and an upper sheet; these were of silk.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6090