It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "The muhrim (one in the state of ihram) should not wear a shirt, nor a qaba' (cloak), nor trousers, nor a turban, nor a burnus (hooded cloak), nor any garment touched by saffron or wars (a yellow dye)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13043