‘I can dig it for you, Master Marner’, said the young man in fustian, who was now by Eppie’s side…

George Eliot Silas Marner

How amazing it is that meaning of fustian was originally a strong cotton and linen fabric (here Aaron is wearing a fustian suit) and became pompous or pretentious talk or writing! So are both merely ways of acting better than one is?