Hi Jon, mechanics as early as 1916 were wearing dark blue or black overalls according to M Windrow and crew were wearing black overalls before the official acceptance in 1935, so maybe that was what they were for, work wear. The pair I have are not typical British manufacture, so I would guess Indian pre 1923, hence their rarity? Oil stains would show up much more on tropical dress so I can imagine they would be more likely to adopt black work wear, hope this helps Mike
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