Myths, truths, and fashion

On the Fashion System (1967) Roland Barthes says: 'Contrary to the myth of
improvisation, of caprice, of fantasy, of free creativity, we can see that fashion
is strongly coded. It is ruled by combination in which there is a finite reserve
of elements and certain rules of change. The whole set of fashion features for
each year is found in the collection of features which has its own rules and
limits, like grammar'. Now, doesn't Barthes' provocation contain a grain of truth
for most design disciplines?