Sayyiduna Ibn Umar (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) was asked about the clothing of a person in Ihram, so he (peace be upon him) said: "Do not wear a shirt, turban, trousers, cap, or leather socks. However, if one does not have sandals, then he may wear leather socks, but he should cut them below the ankles."
Hadith Referenceسنن دارمي / من كتاب المناسك / 1838
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده جيد والحديث متفق عليه، [مكتبه الشامله نمبر: 1841]