Starting a clothing line with only tshirts?

I'm thinking about starting an online clothing brand, and I wanted to start with tshirts. If all goes well I will eventually add iPhone cases, snapbacks, sweatshirts, etc. But I'm starting with only tshirts. Is there any way an online clothing line can be successful selling only men's tshirts? Or is there too much competition to make any money in this business? Any feedback would be helpful.

Far too many people have the idea to sell tshirts it's a highly competitive, saturated field, unless you came out with something innovative like www.themountain.me/AnimalTees and had a promotion budget, I don't see a lot of chances of success.

Aside from the normal online stores, there are hundreds of thousands of people with mini stores setup on print on demand sites like Zazzle.com, cafepress.com customink.com

To give you an idea of the size of the crowd you can be lost in, here are the approximate number of pages on these sites:
cafepress.com 598 million pages! Zazzle.com 37.5 million pages, spreadshirt.com 9.9 million pages, Customink.com 0.4 Million pages

One guy reported here that he invested $1000 in new designs and a nice looking sales site and was still waiting for his first order.

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