كتاب مناسك الحج
Read the English translation first, with the original Arabic directly underneath.
It was narrated from Ibn 'Umar that:
a man asked the Messenger of Allah what garments we should wear when we enter Ihram. He said: "Do not wear shirts, or pants, or 'Imamahs, or burnouses, or Khuffs unless someone does not have any sandals, in which case he should wear Khuffs that come beneath the ankles. And do not wear any garment that has been touched by (dyed with) Wars or saffron.
لاَ تَلْبَسُوا الْقَمِيصَ وَلاَ السَّرَاوِيلاَتِ وَلاَ الْعَمَائِمَ وَلاَ الْبَرَانِسَ وَلاَ الْخِفَافَ إِلاَّ أَنْ يَكُونَ أَحَدٌ لَيْسَتْ لَهُ نَعْلاَنِ فَلْيَلْبَسِ الْخُفَّيْنِ أَسْفَلَ مِنَ الْكَعْبَيْنِ وَلاَ تَلْبَسُوا مِنَ الثِّيَابِ شَيْئًا مَسَّهُ وَرْسٌ وَلاَ زَعْفَرَانٌ