(10) The Rites of Pilgrimage
كتاب المناسك
(12a) Chapter: What one who is in the Sacred State must avoid - Section 1
(11) باب ما يجتنبه المحرم
Mishkat al-Masabih 2679 
Ibn ‘Abbas told of hearing God’s messenger saying in the course of an address, “When one who is on pilgrimage cannot get sandals he may wear shoes, and when he cannot get a lower garment he may wear trousers,” Bukhari and Muslim.
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَخْطُبُ وَهُوَ يَقُولُ: «إِذَا لَمْ يَجِدِ الْمُحْرِمُ نَعْلَيْنِ لَبَسَ خُفَّيْنِ وَإِذَا لَمْ يَجِدْ إِزَارًا لَبَسَ سَرَاوِيل»
 مُتَّفَقٌ عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 2679
In-book reference : Book 10, Hadith 169