About your page getting viral the problem, for me, if that the project doesn't exist. I will not recommend something that don't exist/I haven't tried first, except if I'm sure it will work/happen. If you have a real store I will definitely forward it to most of my friends that would wear this and/or like to buy this for me (like I just did with my gf who likes to buy me this kind of shirts).
For fake account you really should reconsider it. I don't think it's that easy to detect in the end (except for people trying to earn 1M$ of course), but it seems pretty easy to game the systems for 100/200$. And I don't think that tying the 1$ reward to a real order is a stopping point in the end.
For the email part, I don't know if it's a big selling point, at least not as the first description, but it could be nice to have a small description of you and your wife like on the right or an "about us" or "Meet the team" (a lot of current YC startups use this with their launchrock page). The thing is that, for me, the signup confirmation email is a bit too long.
I can understand that a launchrock page is really easier to easily garner emails and have an idea of how many people could be interested. The site/idea would juste seem more real if it was not just a launchrock page.
I like the idea to apply to kickstarter. But part of me thinks that most of the costs link to your project would be handle upfront by your customers, no? If you provide links to 5 t-shirts designs and offer a pre-order option you can ensure you have enough orders before starting producing and then don't have to spend a lot of money before being sure you'd sell anything.