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For those into denim, this 1942 Kodachrome 4x5 image of a Coast Guardsman standing watch over a PT boat show early war USN chambray and denim trousers pretty clearly.
July 1944. New York. "Under the Third Avenue IRT elevated train line, looking north at East 58th Street." Color transparency by Andreas Feininger for Life magazine.
March 1943. "Camouflage class at New York University, where men and women are preparing for jobs in the Army or in industry. This model has been camouflaged and photographed. The girl is correcting oversights detected in the camouflaging of a model defense plant."