If you have rich friends ... you can start there ... and if they love your stuff, ask them to share the info with their friends ... and you might just get a little buzz going ... sort of like a secret new designer. . That's about the only way you'll be able to get to rich women ... without doing through the usual channels.
Trying to sell directly to the rich customer is backwards ... and there's probably a reason it usually doesn't work that way. It's much harder than you think to get to them.
I honestly do not think that the typical high end customer would buy from you on line .... unless they know you or your line, have worn it before and feel like they can buy it without actually touching it and trying it on. So, that is not a realistic option to introduce a high end line to wealthy clients or their stylists.
So, if you don't want to sell to buyers for established, high end stores, that pretty much means you would have to open your own shop in a "rich" neighborhood. Then you would need to advertise and promote the heck out of it ... to get them interested and to encourage them to come in to checkout your line. Were talking hundreds of thousands of dollars here to get it up and running, so hopefully your are either rich yourself, or have a rich benefactor or investor who sees your vision.
The promotional part would look something like this:
Invite, fashion editors, fashion stylists and socialites to private showings in your beautiful new shop, prior to your official opening, to get some buzz going. That requires knowing who to reach out to ... and how to do it ... you have to reach their representatives (managers, publicists, assistants, etc.). You would hire a PR company to do set all of this up and contact the right people.
Then you would hold a huge, highly publicized Grand Opening Party at your shop (cocktails, food, entertainment, gorgeous décor, the whole thing). This is not a time to scrimp. The first impression of your shop and your line can make or break you ... so it has to be spectacular enough to make your shop more appealing look better than all the other lingerie shops and department stores in the city. And you line must meet those expectations too ... just blow them away.
You would need to hire an event planner to make this Grand Opening spectacular enough to impress the jaded, wealthy customer. You should have at least one big celeb or more (most likely you will have to pay them to attend) and as many of the community's well know socialites as possible. If you can attract the press, they will publish photos and article in local magazines and newspapers. Your invitations will by managed by your PR company ... they have the know how and the connections to get this done.
Then, after you open, to keep the buzz going, and to ensure that you have a stead flow of new customers you will pay for regular advertising in your city ... your shop's name needs to be everywhere wealthy women are. Maybe a billboards in a couple of strategic places, one near your shop and maybe one in another prestigious shopping area. You would need to have professional photo shoots, and use those photos to place ads in high end local magazines and in the society pages of the newspapers. You would sponsor high end charity/museum/hospital fund raising events (which are usually attended by wealthy donors) which will get your name in the programs. Just a few basic things you will need to do to get the word out .....
Or ... you can sell your line to buyers who already have rich customers. And build you name from there, opening a shop later, when your name is a household word.
Here's a thread with some information that might help ... although it's more about selling to buyers, not directly to the customer. And, in fact, someone posted what a buyer is looking for in a luxury line in that thread on the first page. But it's relevant because it's what the customer would be looking for, too. If you are interested here's that first page:
http://forums.thefashionspot.com/f90/selling-my-line-buyers-boutique-owners-30506.html