That the dictionary referrs to stuff as the cloth for junior barristers' gowns makes sense. When a barrister becomes a QC, ie a senior barrister, he's said to "take silk" and has a different gown. And there is greater knowledge behind this comment tha just watching Rumpole!
And skimble, that there was a big use for "stuff" must have been so as my greatgrandfather who put in 1891 census " retired stuff merchant" as his occupation died in 1896 and left heaps on money.
charlotte