unity – Overlay the human model for virtual fit-on

I am doing a project based on virtual fit-on so, using o3n_male_female assets in unity. In the project first developing an avatar by using DNA controllers after that the 3D dress in the system have to overlay according to the body measurements and dress measurements. Ex: If user select a Medium size T-shirt if that user is an adult when he wear it that avatar should show that is tied. Any suggestions to develop it