472005 Fashion Retail Website

I want to build a fashion retail website similar to asos.com. I have a dropship supplier that has a website of their own but they do not provide product feeds. I therefore need my site to be able to pull the products, descriptions & prices from their website automatically. Their pictures also have a watermark on some of them so I need the system to be able to adjust this to my site logo. If the description mentions their site name this would also need to auto adjust. As the suppliers site stock more than just clothing I would also want to be able to select just the categories I want to show on my site.