Identify basic parameters of clothes as variables eg waist, length fit type weight etc. and create a 3D model based on those and provide best 5 models with the fitment of apparel. Let the customer chose which one is closest match, learn from the ratings and over a period of time either provide the best 3 with reasonable accuracy or just the one once parameters are well tuned. Similarly, look for models to provide best color match and description for feel of the fabric.