I'd focus my energy on making a deal with a large bricks and mortar retailer for the top n shirts, possibly as a loss-leader just to advertise my site (on the c

I'd focus my energy on making a deal with a large bricks and mortar retailer for the top n shirts, possibly as a loss-leader just to advertise my site (on the clothing tag) to drive traffic there. Basically something different than what your competitors are doing (focusing on design and t-shirt quality).