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Reference information: Chambray Fabric
Chambray is a closely woven plain weave fabric mostly made from cotton. It is soft and smooth with a slight luster. It wears well and is easy to sew and launder. It is lightweight, yet strong fabric with a denim look.
The fabric is made of dyed warp (down) and white or unbleached filling (across). Both carded or combed yarns are used. It has a white selvedge to prevent raveling and has a very soft coloring (often light blue), which creates a faded look. Some are also made in stripes, checks or embroidered.
Chambray fabric originated from Cobrai or Cambrai, a city in north France where it was originally woven for farmer's wardrobes. This was actually the fabric choice for the working man's blue shirt. Hence, the term blue-collar worker came into use.