كتاب الحج
15  
The Book of Pilgrimage
(1)
Chapter: What one who has entered Ihram for Hajj or Umrah is permitted to wear, and what is not permissible, and perfume is forbidden for him
(1)
باب مَا يُبَاحُ لِلْمُحْرِمِ بِحَجٍّ أَوْ عُمْرَةٍ وَمَا لاَ يُبَاحُ وَبَيَانِ تَحْرِيمِ الطِّيبِ عَلَيْهِ
Sahih Muslim 1177 c

Ibn 'Umar reported that the Messenger of Allah (ﷺ) forbade the Muhrim to put on a cloth dyed in saffron or wars and he further said:

One who does not find shoes (to wear) he may wear stockings, but (only) after trimming them below the ankles.
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ، عُمَرَ - رضى الله عنهما - أَنَّهُ قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ يَلْبَسَ الْمُحْرِمُ ثَوْبًا مَصْبُوغًا بِزَعْفَرَانٍ أَوْ وَرْسٍ وَقَالَ ‏ "‏ مَنْ لَمْ يَجِدْ نَعْلَيْنِ فَلْيَلْبَسِ الْخُفَّيْنِ وَلْيَقْطَعْهُمَا أَسْفَلَ مِنَ الْكَعْبَيْنِ ‏"‏ ‏.‏
Reference : Sahih Muslim 1177c
In-book reference : Book 15, Hadith 3
USC-MSA web (English) reference : Book 7, Hadith 2649
  (deprecated numbering scheme)