A few weeks ago, Gab Waller received a request from a regular client — a 40-something Californian with a lot of money to burn: a series of screen grabs of every dress from the brand new Chanel ready-to-wear line-up.  That client had one instruction for Waller, a sourcing guru who can unearth sold-out must-haves from almost any designer. “I want them all,” she said. Welcome to the world of the VVICS — the very very important clients, who can casually drop hundreds of thousands of dollars on