Denim

DENIM
(also called blue jeans, jeans, dungarees, or levi's )
historical evolution / trend 2000 / material
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by birgit lohmann, 2000

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the history of denim, the fabric phenomenon
of the last centuries: the 18th century
in the eighteenth century as trade, slave labour,
and cotton plantations increased, workers wore jean cloth
because the material was very strong and it did not wear out easily.

Source:http://www.designboom.com/eng/education/denim2.html
http://www.noticemejeans.com