I thought lots of well off people or those in the public eye had stylists.
This idea is purely based on the Marian Keyes book "This Charming Man", mind you, in which one main character is a stylist.
Edited to say:
I have every respect for the amount of research MK does for her books, so don't think I'm being too foolish in thinking that her description of her character's job is pretty accurate.