Someone already suggested hemp, but there is also other fibres like linen.
At the end of the day clothing would not be an issue at all, if clothes were made to last and worn accordingly. Unless you work in blue collar jobs, the wear on clothes is minimal and there is no reason why a set of shirts shouldn’t last you a decade.
If my business is local, buying from local suppliers as much as possible and employing local people it shouldn’t matter at all, if these local employees are ethnically the same and all have the same nationality.
So i would take it more as the former, ultra nationalist.