There are two reasons I never buy clothes online: I don’t know how they will fit or look on me.
I’d love to be able to upload an image and then body dimensions and do a virtual fitting. I could then show my wife or friends what it looked like and get their opinions.
A great additional feature would be the marketing aspect. If I was trying on Brooks Brothers pants and showing friends I’d be advertising the brand. Then you have Facebook apps and more. Harness your customers–they are by far your best marketers.