I'm not sure I see the point of this vs. going to a store or ordering online. Not just for the dress, but all printers. How often does someone think they'll use it?
With some of the newer rubber-like flexible materials 3D printing tech makes more sense for things like shoes, than it does other types of clothing. We might see it in local stores for made-to-order hard goods, in the future, but I doubt that it will really ever be viable in the average home. Go online, design your shoes, coffee mug, desk lamp, etc., and then drop by the shop the next day to pick it up; maybe.
For the time being, it is not quite easily available/economical for the home, but that will eventually change, I am sure. I noticed that it took a lot of time and detail to clear the unused medium from the finished product. that is a present limiting factor. I am thinking it will eventually become easier to work with. I AM, however, concerned about the need for the masks, people being sensitive to the medium powder. It could cause lung problems for some people.