The Source: Any Major Department Store
The Service: Whereas using a personal shopping with a place like Bergdorf Goodman or Saks used to not only require a certain degree of wealth, but proximity to the company's New York City flagship, these days the service is open to anyone, anywhere. Big national retailers all have a teams of digital stylists on hand to answer style questions, send product suggestions and offer advice. (Or, if you'd prefer to do things in person, many of these brands—including Macys, Nordstrom and Bloomingdales—offer personalized in-store assistance at locations around the country.)
The Cost: Aside from shipping and the price ranges of clothes (all of which vary from shop to shop) it's always free.
The Commitment: It really depends on the type of service you're looking for. Are you hoping to set up a longterm try at home system? That's going to be a lot of back and forth with the same salesperson. One-off shopping queries, though, are often no more complicated than shooting off a quick email.