Every so often I re-read Emily Post's chapter on clothing in Etiquette* as sort of a booster shot for good intentions. This time I noticed she mentions "homespun" fabric.
As in, it was good etiquette to wear clothes made of homespun when out in the country or on a golf course.
As in, rich people wore it.
I'm guessing with all the social occasions Post describes, they didn't have time to spin the stuff themselves.
*I have the "new and enlarged edition," fourteenth edition, printed in 1934.