Backlinks are key. I have a website in the Top 10 in Google for the keyword "t-shirts". We have over 450 manually edited link partners, and hundreds of other links to us from people I don't even know about. There are over 20 million results in Google for the search "t-shirts". Our success is solely related to having a great links directory, closely themed around clothing, apparel, and t-shirts.
You will need to spend the time, money, effort to create a stellar links directory that is full of useful sites (not crappy link farms or directories) that will help your visitors. Concentrate your efforts on getting quality content, quality links (links you would actually visit!), and lots of incoming links. You will do really well in the search engines if you buckle down and apply yourself to the task of link management.
I promise! 
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