The Prophet (ﷺ) said, "Whoever cannot get an Izar, can wear trousers, and whoever cannot wear sandals can wear Khuffs (socks made from thick fabric or leather)."
Sahih al-Bukhari Book 77, Hadith 22
← Previous Hadith A man said, "O Allah's Messenger (ﷺ). What type of clothes should a Muhrim wear Allah's Messenger (ﷺ) replied, 'Do not wear shirts, turbans trousers hooded cloaks or Khuffs (socks made from thick fabric or leather); but if someone cannot get sandals, then he can wear Khuffs after cutting them short below the ankles. Do not wear clothes touched by saffon or wars (two kinds of perfumes).

Sahih al-Bukhari Book 77, Hadith 21 Next Hadith → A man got up and said, O Allah's Messenger (ﷺ)! What do you order us to wear when we assume the state of Ihram?" The Prophet (ﷺ) replied, "Do not wear shirts, trousers, turbans, hooded cloaks or Khuffs (socks made from thick fabric or leather), but if a man has no sandals, he can wear Khuffs after cutting them short below the ankles; and do not wear clothes touched with (perfumes) of saffron or wars."

Sahih al-Bukhari Book 77, Hadith 23