Sayyiduna Ibn Umar (may Allah be pleased with them) narrates from the Noble Prophet (peace and blessings be upon him) that he said: "So if a Muhrim does not find shoes, then he should wear leather socks, and he should cut those socks so that they are below the ankles."
Hadith Referenceصحيح ابن خزيمه / جماع أبواب ذكر أفعال اختلف الناس فى إباحته للمحرم، نصت سنة النبى صلى الله عليه وسلم أو دلت على إباحتها / 2685