'Pants (are allowed) for one who cannot find an Izar, and Khuffs for one who cannot find sandals to wear in Ihram.;;  

سَمِعْتُ النَّبِيَّ ﷺ يَخْطُبُ وَهُوَ يَقُولُ السَّرَاوِيلُ لِمَنْ لاَ يَجِدُ الإِزَارَ وَالْخُفَّيْنِ لِمَنْ لاَ يَجِدُ النَّعْلَيْنِ لِلْمُحْرِمِ  

'Whoever cannot find an Izar, let him wear pants, and whoever cannot find sandals, let him wear khuffs."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ لَمْ يَجِدْ إِزَارًا فَلْيَلْبَسْ سَرَاوِيلَ وَمَنْ لَمْ يَجِدْ نَعْلَيْنِ فَلْيَلْبَسْ خُفَّيْنِ