From Sahih Bukhari (Hadith 1842):
Narrated `Abdullah:Allah's Messenger (ﷺ) was asked what sort of clothes a Muhrim should wear. He replied, "He should not wear a shirt, turbans, trousers, a hooded cloak, or a dress perfumed with saffron or Wars; and if slippers are not available he can wear Khuffs (socks made from thick fabric or leather) but he should cut them so that they reach below the ankles
Reference: Bukhari 1842