How should I start selling on farfetch.com or yoox.com?

Think big. Start small. You should always think of the bigger picture (i.e. Facebook for everyone in the world), because you want to make sure that you enable yourself to grow towards that point. Using Steve Jobs' analogy, it's about anticipating where the dots will be. Or as Wayne Gretzky puts it: skate to where you expect the puck will be, not where it is at the moment. Having this bigger vision in mind, will help you move forward. That said, always start small. If you can make your product or service valuable for a small group of people (that are also representative of a bigger population), you can definitely figure out ways to reach those people. The initial challenge though is to make those first 10 / 100 / 1000 people really use your product or service (and preferably pay for it).

Get into a showroom that has these connections. I'm with one in Los Angeles so I don't have to worry about sales. I have connections with a few that work with the majors. It will cost a min of 500 a month but that's the way to do it right. Just be aware of Be cautious, as there are showrooms that don't produce results, and simply collect on monthly fees. I'd love to hear more about your product!

There are several options available which would work for SaaS. The best one I can suggest is Referral Program. The referral program would need to have Training Documentation well defined as well as marketing material. This would allow you to pay other consultants or individuals to pipe leads or signups to your site to get exposure. This is especially effective in SMB market and tends to be targeted to the customer who would purchase. The second is to be more specific in contacting specific demographic targeted customers (be aware in the US you must be subscribed to Do Not Call Registery to Scrub call list for telemarketing or be potentially be fined by US Government). You can engage Lead generators to accomplish this for you but be careful that they are registered and scrub their list against the US Do Not Call Registery. Email Campaigns are good if you have users who have requested to opt into receiving an email and also have opt out options to remove themselves from the list to comply with US and other countries SPAM Laws. Then there are advertising though multiple media types beyond email and banner advertisements such as radio, TV, Billboards, Magazines and other print media.

Have you considered providing the book in electronic format. If somebody wants the book and are willing to pay the shipping fee, they get the paper copy, otherwise, it's a download.

I've worked in the fashion industry for several years with and with numerous manufacturers. I think it is because it costs $$$ to make bespoke products. Generally consumers only want to pay $ or $$ for basic clothing. You would have to figure out how to sell basics for $$$. Let me know if you'd like a follow up!