Sunan an-Nasa'i, Volume 3, Book 24, Hadith 2668 (DarusSalam) ⓘ

It was narrated from Salim that his father said: "The Messenger of Allah was asked what clothes the Muhrim may wear. He said: 'He should not wear a shirt, or a burnous, or pants, or an 'Imamah (turban, or any garment that has been touched by (dyed with) Wars or saffron, or Khuffs except for one who cannot find sandals. If he cannot find sandals, then let him cut them until they come lower than the ankles, (sahih)

أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، عَنْ سُفْيَانَ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ سُئِلَ رَسُولُ اللَّهِ صلى الله عليه وسلم مَا يَلْبَسُ الْمُحْرِمُ مِنَ الثِّيَابِ قَالَ ‏ "‏ لاَ يَلْبَسُ الْقَمِيصَ وَلاَ الْبُرْنُسَ وَلاَ السَّرَاوِيلَ وَلاَ الْعِمَامَةَ وَلاَ ثَوْبًا مَسَّهُ وَرْسٌ وَلاَ زَعْفَرَانٌ وَلاَ خُفَّيْنِ إِلاَّ لِمَنْ لاَ يَجِدُ نَعْلَيْنِ فَإِنْ لَمْ يَجِدْ نَعْلَيْنِ فَلْيَقْطَعْهُمَا حَتَّى يَكُونَا أَسْفَلَ مِنَ الْكَعْبَيْنِ ‏" ‏ ‏.‏