He heard the Prophet [SAW] say in 'Arafat: "Whoever cannot find an Izar (waist wrapper), let him wear trousers, and whoever cannot find sandals, let him wear Khuffs (leather socks)."  

أَنَّهُ سَمِعَ النَّبِيَّ ﷺ يَقُولُ بِعَرَفَاتٍ فَقَالَ مَنْ لَمْ يَجِدْ إِزَارًا فَلْيَلْبَسِ السَّرَاوِيلَ وَمَنْ لَمْ يَجِدْ نَعْلَيْنِ فَلْيَلْبَسْ خُفَّيْنِ