(1) باب مَا يُبَاحُ لِلْمُحْرِمِ بِحَجٍّ أَوْ عُمْرَةٍ وَمَا لاَ يُبَاحُ وَبَيَانِ تَحْرِيمِ الطِّيبِ عَلَيْهِ
Ibn 'Abbas (Allah be pleased with both of them) reported:
I heard Allah's Messenger (ﷺ) say as he was delivering an address: So far as the trousers are concerned, one who does not find lower garment, he may wear them; as also socks, he may wear them who does not find shoes. It concerns the Muhrim. (ID)
Reference (ID): Sahih Muslim 1178 a (ID)
In-book reference (ID): Book 15, Hadith 4 (ID)
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 2650 (ID)