From the BBC…
The word hijab comes from the Arabic for veil and is used to describe the headscarves worn by Muslim women. These scarves come in a myriad of styles and colours. The type most commonly worn in the West is a square scarf that covers the head and neck but leaves the face clear.
The al-amira is a two-piece veil. It consists of a close fitting cap, usually made from cotton or polyester, and an accompanying tube-like scarf. The shayla is a long, rectangular scarf popular in the Gulf region. It is wrapped around the head and tucked or pinned in place at the shoulders.
The khimar is a long, cape-like veil that hangs down to just above the waist. It covers the hair, neck and shoulders completely, but leaves the face clear. The chador, worn by many Iranian women when outside the house, is a full-body cloak. It is often accompanied by a smaller headscarf underneath.
The niqab is a veil for the face that leaves the area around the eyes clear. However, it may be worn with a separate eye veil. It is worn with an accompanying headscarf. The burka is the most concealing of all Islamic veils. It covers the entire face and body, leaving just a mesh screen to see through.