According to the Rulebook
This long, quilted coat is known as a jibbah. It was worn by an Ansar, a Sufi Muslim warrior and follower of El Mahdi, in northern Sudan in the late 19th century. The split down the front enabled it to be worn both on horseback and on foot. Muslim Europeans would have worn it under mail but in the Sudan and Nigeria it was often worn alone. It is made from cotton called dammur, spun by women and woven by men. This jibbah has a more complex and colourful woven pattern than most, the conventionally vertical and horizontal quilting lines spaced 1-3 cm apart.
"Two layers of cloth with padding in between sewn together."
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Typically quilted cloth armor takes the form a Gambeson which is worn either on it' own or under other armor. Arming caps And sometimes pants or skirts were also padded. In period the fabric was typically linen stuffed with more linen or possibly wool batting or straw. In modern times with typically use cotton, stuffed with cotton or synthetic batting.
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