Where Can You Buy The Really Expensive Clothes?

Not that I can afford them (I’m 16). I was just wondering where does someone purchase clothes by top of the line designers such as Hermes, Louis Vuitton, Dior, Burberry, and the like?
One would think, “Fancy places like Neiman Marcus, duh.” But the truth is those places focus on offering “ready to wear” (or actual clothes as opposed to accessories) for women, and mainly focus on things such as scarves, shoes, and ties from the higher fashion brands.
And the stores of the brands such as Burberry for example, usually carry a VERY limited selection of merchandise, usually including women’s handbags, scarves, and the occasional dress.
So, it makes me wonder, where do rich people get there Hermes coats and Dior dresses? Because anybody can stumble into Saks and buy some Gucci jeans and a John Varvatos shirt.
Also, what about custom fitting items? How are those acquired?
Just a question that I can’t seem to find an answer for! Thanks!

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