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I think for website that sells shirt it lacks some bright colors. Shirts you buy on a website like this one are supposed to be fun shirts, so the design needs to follow. Nothing shows that you sell shirts either, no models, no pictures of any shirt anywhere.
About the UI, I notice 2 main problems:
Your main navigation (home, mens, womens, etc...) should not be above your header image, this is way to high, people won't scroll all teh way above the header to see your nav. You can keep your tab style navigation but coming from underneath the head.
The other issue is that when you get to the site for the first time, then only clue we have about what the site is about is the slogan "shirts you wear" then you see square thumbnails. You should move some your text above that, at least one sentence, written in big that you can use as a h1 tag in your html to give the user a better clue about what this is all about. Something like "HoboSauce, the place for fun shirts!" or something like that.
Hope it helps.
