"I heard the Prophet (may Allah's peace and blessings be upon him) delivering a sermon at ‘Arafāt, in which he said: ""Whoever does not find slippers or sandals (Na‘l) may wear leather socks (Khuff), and whoever does not find a waist sheet (Izār) may wear pants (Sirwāl).' He meant the pilgrim in the state of Ihrām."" [Al-Bukhari]"

"عن عبد الله بن عباس -رضي الله عنهما- قال: «سمعت رسول الله -صلى الله عليه وسلم- يخطب بِعَرَفَاتٍ: من لم يَجِدْ نَعْلَيْنِ فَلْيَلْبَسِ الخُفَّيْنِ، ومن لَمْ يَجِدْ إِزَارًا فَلْيَلْبَسْ السَّرَاوِيلَ -للمحرم-». [صحيح.] - [رواه البخاري.]"