Assuming your designs are printable, why not test out some of your designs on a community like Threadless? Allows you to "launch early and iterate" and get early "user" feedback with minimal financial risk. It'll allow you to gauge the popularity of different designs without having to actually have the clothes made.
As there's already an established community around Threadless, it might also be a good way to build an initial following for your brand/style.
As there's already an established community around Threadless, it might also be a good way to build an initial following for your brand/style.