Dickies? Something like this https://www.thepriorymenswear.co.uk/products/dickies-original-874-work-pants-brown-duck
You want cotton herringbone twill not a poly/cotton mix tho'... I can heartily recommend the Denime WW2 chinos, not sure where you'd buy them these days but they look and feel just like the real thing...
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Dickies? Something like this
https://www.thepriorymenswear.co.uk/products/dickies-original-874-work-pants-brown-duck