In fact, I'm certain that one of the French revolution trigger was notables who saw those productivity increase improve their life, then being taken away to found wars or whatever.
In essence, if we want some sweeping generalizations and be generous, then assuming 1%/9%/90% for upper/middle/lower class is roughly in the ballpark for most societies until the 20th century.
So while the noble families are nowhere near 10%, it's not entirely wrong to assert that the top 10% including all the non-noble bourgeoisie, the merchants, doctors, lawyers, officers, etc, would have the means and desire to care about fashion.
In France it was down to less than 1% at the time of Revolution, but some countries like Spain that had centuries long wars, was closer to 6-8% range.