"O Messenger of Allah, what clothes should we wear when we enter Ihram?" He said: "Do not wear a shirt (or shirts), or 'Imamahs, or pants, or Khuffs unless someone Cannot find sandals, in which case he should cut them (the Khuffs) so that they come beneath the ankles or any garment that has been touched by (dyed with ) wars or saffron. (Using translation from Nasāʾī 2670)  

يَا رَسُولَ اللهِ مَا نَلْبَسُ مِنَ الثِّيَابِ إِذَا أَحْرَمْنَا؟ قَالَ «لَا تَلْبَسُوا الْقُمُصَ» وَقَالَ عَمْرٌو مَرَّةً أُخْرَى «الْقَمِيصَ وَلَا الْعَمَائِمَ وَلَا السَّرَاوِيلَاتِ وَلَا الْخُفَّيْنِ إِلَّا أَنْ لَا يَكُونَ لِأَحَدِكُمْ نَعْلَانِ فَلْيَقْطَعْهُمَا أَسْفَلَ مِنَ الْكَعْبَيْنِ وَلَا ثَوْبًا مَسَّهُ وَرْسٌ وَلَا زَعْفَرَانٌ»