I don't like the color scheme. Dark seems unwelcoming, and in combination with the vibrant yellow color and the scrolling text, I would think this site was 10 years older. You don't strictly have to do anything about the color scheme, it's not catastrophic and it is a matter of personal taste, but please: Remove the slider –*it is visually distracting and annoying.
I also think you are using the logo (red, yellow paper thingy) a bit too much in headings, offer banners, etc. The logo is big enough in the header, it doesn't need to be used on the page too.
One little problem in the navigation: When you go from the "main" info site to the shop, the navigation changes. That is a big usability no-no. The user becomes confused because the navigation isn't consistent, while the layout is. What about having a second navigation bar below the main navigation, with “guys, girls, sale” and additional categories?
Other than that, I think your site rocks! Everything is laid out clearly, which is the most important thing. And your shirts look great. Keep up the good work.