Sayyiduna Abdullah bin Umar (may Allah be pleased with him) says that a man stood up and said: O Messenger of Allah (peace and blessings be upon him), what do you command us regarding the clothes of the one in ihram? He (peace and blessings be upon him) said: "Do not wear shirts, trousers, turbans, hooded cloaks (burnus) or leather socks (khuffs). However, if someone does not have sandals, he may wear leather socks, cutting them below the ankles. And do not wear any garment touched by saffron or wars, and a woman in ihram should neither wear the niqab nor wear gloves."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9040