Muwatta Malik, Book 20, Hadith 13 (USC-MSA)

Yahya related to me from Malik from Yahya ibn Sa'id that he heard Said ibn al Musayyab say, about the girdle worn by some one in ihram under his clothes, "There is no harm in it if he ties the ends together as a belt." Malik said, "This is what I like most out of what I have heard about the matter."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ سَمِعَ سَعِيدَ بْنَ الْمُسَيَّبِ، يَقُولُ فِي الْمِنْطَقَةِ يَلْبَسُهَا الْمُحْرِمُ تَحْتَ ثِيَابِهِ أَنَّهُ لاَ بَأْسَ بِذَلِكَ إِذَا جَعَلَ طَرَفَيْهَا جَمِيعًا سُيُورًا يَعْقِدُ بَعْضَهَا إِلَى بَعْضٍ ‏.‏ قَالَ مَالِكٌ وَهَذَا أَحَبُّ مَا سَمِعْتُ إِلَىَّ فِي ذَلِكَ ‏.‏

sunnah.com

also referenced under: Book 20, Hadith 720 (In-Book)

Yahya related to me from Malik from Yahya ibn Said that al-Qasim ibn Muhammad said that al-Furafisa ibn Umayr al-Hanafi saw Uthman ibn Affan at al-Arj, and he was covering his face while in ihram.

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ، أَنَّهُ قَالَ أَخْبَرَنِي الْفُرَافِصَةُ بْنُ عُمَيْرٍ الْحَنَفِيُّ، أَنَّهُ رَأَى عُثْمَانَ بْنَ عَفَّانَ بِالْعَرْجِ يُغَطِّي وَجْهَهُ وَهُوَ مُحْرِمٌ ‏.‏

sunnah.com

also referenced under: Book 20, Hadith 721 (In-Book)

Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say that a man in ihram should not veil anything above his chin.

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ مَا فَوْقَ الذَّقَنِ مِنَ الرَّأْسِ فَلاَ يُخَمِّرْهُ الْمُحْرِمُ ‏.‏

sunnah.com

also referenced under: Book 20, Hadith 722 (In-Book)