"I heard the Prophet say; 'do not wear shirts, or pants, or 'Imamahs, or burnouses, or Khuffs while in Ihram.'''(sahih)
Sunan an-Nasa'i Book 24, Hadith 60
← Previous Hadith "A man came to the Prophet and said: 'What should we wear when we enter Ihram?' He said: 'Do not wear shirts, or 'Imamahs, or burnouses, or pants, or Khuffs unless there are no sandals; if there are no sandals, then wear Khuffs that come beneath the ankles. And (do not wear) any garment that has been dyed with Wars or saffron, or has been touched by Wars or saffron.

Sunan an-Nasa'i Book 24, Hadith 59 Next Hadith → "I heard the Messenger of Allah say; 'If you cannot find an Izar then wear pants, and if you cannot find sandals then wear khuffs, but cut them so that they come lower than the ankles.

Sunan an-Nasa'i Book 24, Hadith 61