firstly it is sunnah to praise ALLAAH, Ta’ala before starting
Surah Al-Fatiha(1), Verse 2:
الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ
Praise be to Allah, the Cherisher and Sustainer of the worlds;
(English – Yusuf Ali)
Hijaab in Arabic means covering or concealing. Hijaab is the name of something that is used to cover. Everything that comes between two things is hijaab.
Hijaab means everything that is used to cover something and prevent anyone from reaching it, such as curtains, door keepers and garments, etc.
Khimaar comes from the word khamr, the root meaning of which is to cover. For example, the Prophet (peace and blessings of Allaah be upon him) said: “Khammiru aaniyatakum (cover your vessels).” Everything that covers something else is called its khimaar.
But in common usage khimaar has come to be used as a name for the garment with which a woman covers her head; in some cases this does not go against the linguistic meaning of khimaar.
Some of the fuqahaa’ have defined it as that which covers the head, the temples and the neck.
DIFFERENCE BETWEEN HIJAB & KHIMAR
The difference between the hijaab and the khimaar is that the hijaab is something which covers all of a woman’s body, whilst the khimaar in general is something with which a woman covers her head.
(3) NIQAB or BURQA
Niqaab is that with which a woman veils her face (tantaqib)…
DIFFERENCE BETWEEN HIJAB & NIQAB
The difference between hijaab and niqaab is that the hijaab is that which covers all the body, whilst niqaab is that which covers a woman’s face only.
conclusion : The woman’s dress as prescribed in sharee’ah (“Islamic dress”) is that which covers her head, face and all of her body.
(source : islamqa.info)
ALLAAH cognizes best