"Fustian jacket or not, he had a good head on his shoulders," remarked one.
Think of that, you in fustian jackets who grumble after meat.
But there also seems to be association with Naples; cf. fustian-anapes for Naples fustian.
It was dark in the shop, and the smell of fustian absorbed the air.
For I heartily despised all that fustian trumpery of the age.
That fustian, ...