If you work a lot with certain niche markets, you can have a specifically targeted website for this market.
A site for photographers to upload and print their own photos on merchandise
A soccer themed site containing soccer shirts, socks, memorabilia
A music themed site where people can print their favourite song lyrics on a tshirt
This is perfect for the Schools, Sporting clubs and Companies who order uniforms from you. You can set them up with their own uniquely branded website which displays the garments and designs specific to their needs.
That way, their members can simply log on and select the item, size and customization they require, and pay for it on the site. It save you and the organisation the headache of paper order forms, chasing payments and have a complicated list of sizes and requirements.
If you work with a school, you would set up the Affiliate site with the school logo and colors. You would only offer the school's approved uniform items - the blue polo shirt, the blue and red sports uniform and so on. You can even apply the logo to the uniform and a template area for the student to personalize with their name.
The ability to set up a uniquely branded site, linked to your Fulfilment site is open to anyone who wants to sell their designs online, but needs someone else to produce the goods.
Graphic designers who offer promotional products as part of their marketing service
Bands or event organisers who sell merchandise for concert tours, etc
Artists or fashion designers, budding tshirt designers