The London-based fashion marketplace could be worth billions, some sources told CNBC. : Online fashion retailer Farfetch plans to interview bankers in upcoming weeks to help lead its New York-based initial public offering, according to sources familiar with the matter. The IPO could come as soon as this year. The London-based company is aiming for a valuation as high as $5 billion, some of the sources said. E-commerce companies are often quickly growing and lacking clear peers in the public markets, so their planned IPO valuations may evolve with market conditions and investor receptivity.