The ritual state of consecration entered before performing hajj or umrah is called ihram.
Ihram is both a sacred state and, in common usage, the clothing associated with entering that state. Pilgrims enter ihram at or before a designated boundary called a miqat, make the intention for the pilgrimage, and recite the talbiyah. The state places limits on ordinary activities, including cutting hair and nails and hunting.
Men commonly wear two unstitched pieces of cloth, while women wear modest clothing that meets Islamic requirements. Ihram is not simply a uniform: the religious state begins through intention and prescribed rites. Tawaf, by contrast, is circumambulation of the Kaaba and is a separate ritual performed during pilgrimage.