Sahih al-Bukhari 5804
Sahih al-Bukhari · Book 77: Dress · Trousers
Narrated Ibn `Abbas:
حَدَّثَنَا أَبُو نُعَيْمٍ ، حَدَّثَنَا سُفْيَانُ ، عَنْ عَمْرٍو ، عَنْ جَابِرِ بْنِ زَيْدٍ ، عَنِ ابْنِ عَبَّاسٍ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ لَمْ يَجِدْ إِزَارًا فَلْيَلْبَسْ سَرَاوِيلَ، وَمَنْ لَمْ يَجِدْ نَعْلَيْنِ فَلْيَلْبَسْ خُفَّيْنِ " .
The Prophet (ﷺ) said, "Whoever cannot get an Izar, can wear trousers, and whoever cannot wear sandals can wear Khuffs (socks made from thick fabric or leather)."