Man how did I miss this thread? Damn.
Anyway, as a teeshirt photographer, I have a bit of experience in this field and I agree with the fact that the photograph itself needs some work. It's technically poor.
However, I also want to make a comment on the composition. I've learned through thousands and thousands of tshirt shots that you have to MINIMIZE what you're not selling. You can't show off all the other clothing in the way you are doing without people assuming you're selling them as well. The jacket is too much. Never have something OVER the item your selling, only under.