An article from (www.muhajabah.com ) presents a brief guide to the rules of dress for the Muslim sister for different situations:
1) Around her husband, a sister may dress however she chooses. There are no restrictions on what the husband can see or touch.
2) Around the (Mahram) relatives, women, and children (a complete list of exemptions is given in Surah an-Nur ayah 31), a sister should cover her (Awra) Display of the hair, arms, lower legs and feet, is universally agreed to be halal for this category.
3) Around (Non-Mahram) men, a sister must cover all of her body except her face and her hands. The face is the circle of the face only and does not include the ears or any of the hair. Just think about what you wash in (Wudu). The covering of the hair, neck, shoulders, and upper chest must specifically be accomplished by the (Khimar) (headscarf). The arms, torso, and legs should be covered by loose, opaque clothing that obscures the shape of the figure.
4) Outdoors and in open public places (such as the market or the Masjid), a sister must wear a (Jilbab) as an outergarment, that is, over her other clothes. If she is wearing a (Khimar), then the (Jilbab) only needs to cover from the shoulders to the ankles, such as a long coat. If she is not wearing a (Khimar), then the (Jilbab) should cover the head and neck as well.
The above rules set out what you need to wear in each situation in order to be observing correct hijab.
Watch the Video to see one way to wear the (Hijab).