Help identifying a work uniform

A friend of mine sold me this uniform knowing I like Japanese items. I have never seen this pattern of what I can only assume is a work uniform. It’s made from white cotton duct material and has green painted metal buttons. The one interior pocket closes with a button made from coconut shell. The pants have matching coconut buttons and are stamped with a 1942 Showa date. I would greatly appreciate any help identifying this uniform.
Thank you in advance,
Victor


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