Constructive criticism, reporting in. I dig the designs on a couple of the shirts, I'd probably wear them. However, your site design is.... lacking. The art gallery theme is cool, at first, but gets old pretty quickly when it inhibits navigation. If you were to do something in Flash, along the same lines, but to make it smoother, than it could be really pretty cool. Also, my other suggestions is to get models to try on your clothes. If you go to your local college or University, you'll find PLENTY of people willing to do a modeling gig for you, for not very much money, especially art students. There are a few I'd buy, but not without seeing the actual merchandise.
Don't let the hate get to you, do what you love.