You can try this...
Go to the Merchant & Network Discovery Tool at http://factory3.datafeedr.com/feeder/search_all
Add a Keyword filter. Use a broad search term in the niche you're interested in. In your case that could be dress, jeans,... or whatever you're looking for in the clothing niche.
Eventually add a Networks filter if you only want to see merchants from a specific network. Click the Find button.
Now add the Merchants filter. You will get a list of the merchants who are selling the products you're searching for.
See video: http://www.datafeedr.com/videos/?vid...rc=yt#videotop