It actually has a very interesting origin but down by definition, it is a sturdy cotton twill fabric, typically blue, used for jeans, overalls, and other items of clothing.

它实际上有一个非常有趣的起源， 但根据定义，它是一种坚固的棉质斜纹织物， 通常是蓝色， 用于牛仔裤、工作服和其他服装。