The few examples of these I've seen offered for sale generally claim they're amphibious engineer or similar. They're Trousers, Fireman's, Bunking. In April 1942, they were developed, and fielded, as P.Q.D. Tentative Specification 155. There had to be a specification before that, but I don't know what it was. Post-war, USA Specification 6-401 was adopted for these. There was a coat that these were matched with. That coat, Coats, Fireman's, Rubber, was standardized in 1939 via USA Specification 20-110.
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Fire crew in 1944. The coats are clearly evident, as to style and identification, but the trousers themselves are harder to identify via the photo.
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The defining characteristic of the trousers is the water-resistant button-in lining.
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As with other small volume items, no contracts were given for these as they were made at the depot.
