Narrated Ibn ‘Umar:
A man asked, “O Allah s Apostle What kind of clothes should a Muhrim wear?” The Prophet, said, “A Muhrim should not wear a shirt, trousers a hooded cloak, or Khuffs (leather socks covering the ankles) unless he cannot get sandals, in which case he should cut the part (of the Khuff) that covers the ankles.”
Sahih Bukhari, Volume 7, Book72, Number 686