You'd need to be able to upload pics, convert to a 3d point cloud based on height and weight entries and not store the original pics.
Then use that information to construct a 3d model and apply clothing textures accurately to them
What would be really cool though, is an inflatable mannequin which could be inflated to near perfectly match that point cloud, which would then be clothed in the garment you want and you would receive a pic of your figure in that actual garment.
Interesting idea there with the mannequin. This bypasses some of the limitations of just applying clothing textures to the 3D model. A mannequin would probably give a much better indication of how items of clothing stretch (or dont stretch) in different places across the body. I imagine this would be very difficult to simulate with current tech.
Logistics though? How do you (cheaply) mass produce mannequins with entirely different dimensions? 3D printer?
Also how would the clothing be fitted to the mannequin? Robots? Do we have a robot that can dress people yet?
There is an easier way. http://www.upcload.com/. From my research in the past year this company is the only one that provides the closest measurement to the nearest mm. They are out of Berlin if my memory serves me correctly.
Seems quite complex, it's a hard problem to solve. My girlfriend routinely sends back clothes cause they don't "feel" right, even though the fit/size is fine. This is something you can't really solve with a computer.
Then use that information to construct a 3d model and apply clothing textures accurately to them
What would be really cool though, is an inflatable mannequin which could be inflated to near perfectly match that point cloud, which would then be clothed in the garment you want and you would receive a pic of your figure in that actual garment.