I've just had an opportunity to watch the shirt module demo video, and I can't say I'm very impressed. The interface seems simple and straightforward enough, but I'm very disappointed with the quality of the virtual garment display. In fact, it isn't even a virtual garment, just an overlay of standard pictures, which, for instance, gives a very false idea of what the checked collar will look like. Only two viewing angles are given, no rotation is shown. There are several far more sophisticated models around nowadays, and I'm sure the clever people in Pune, India could come up with something far better.
As it is, it fulfils probably the most basic needs of a shirt manufacturer that wants to expand into some online individualised ordering.