As long as the shirt itself was white, and not black (as we Arizonians would simply die out there), I do believe I'd be interested.
But I'm with Tebunker - a small logo on the front pocket, full sized thing on the back.
Personally, I like black...but that's just me. Then again, I'm in Wisconsin, where there are four seasons: cold, colder, freezing, and construction.
I like the idea of the logo on the back. What about a long sleeve denim shirt for the winter, or even a short sleeve one? Maybe just have the logo on the front. I'm guessing they'd be more expensive, but a good denim shirt is worth the price.