Get body measurements from image

I am currently a student in University of Chicago. I am working on a fashion project and would like to build a tool where from a click on a page, it opens the camera of the phone or laptop, person takes a photo of his full body and inputs his height. Then the tool would use the height (which is the scale of the image) + the body picture to take a few measurements from his body using image processing, then compare them to a size chart, and recommend the size for that person.