I like the idea, but I'm concerned about paying up front for a style-based product that I haven't seen yet. For example, this kind of thing has been done successfully with wine, but I'm fairly certain I'll like the wine no matter what they send. I can't say the same about a t-shirt. Personally, I don't know how you're going to convince me that I will like the shirt you send when I don't get to see it until I get it.