Abaya is a simple, loose over-garment, essentially a robe-like dress.
Traditional abaya are black and may be either a large square of fabric draped from the shoulders or head or a long. The abaya covers the whole body except the head, feet, and hands. It can be worn with the , a face veil covering all but the eyes. Some women also wear long black gloves, so their hands are covered as well. These days are available in many trendy colors and designs.
Caftan / Kaftan is a variant of the robe or tunic, and has been worn in a number of cultures around the world for thousands of years and is of Asiatic origin.
Styles, uses, and names for the kaftan vary from culture to culture. The kaftan is often worn as a coat or as an overdress, usually having long sleeves and reaching to the ankles. In regions with a warm climate, it is worn as a light-weight, loose-fitting garment. In some cultures, the kaftan has served as a symbol of royalty.