Ihram is the sacred state in which they carry out the required rituals to complete Hajj or Umrah. However, they also have to wear unique clothing that is designed to perform Umrah or Hajj.
Toperform Umrah or Hajj, a Muslim men must wear Ihram. Without Ihram, one's Umrah or Hajj cannot be prefmormed.
Men's Ihram differs from women's, and white men's Ihram is two sheets of white cloths that leave some parts of his body naked, woman's Ihram is the dress that completely conceals her, leaving her face and hands revealed.
Al-Bukhari states that Prophet Mohammed (PBUH) said: "one shouldn't pass the Miqat unless he/she is in the state of Ihram." (Al-Bukhari)