How to properly clothe a human model?

Hi, I am trying to make a virtual fitting room, for that I need to change dynamically the clothe of the human model, I already have a .gltf base model for human, and separare .gltf clothes files, which was model and attached to same base model, but I don’t know how to put together when users click over the different options for clothes. I want a similar result to this: http://mhwebui.wassname.com/. Thank You for your responses and sorry for my terrible English.

EDIT:

There are another example that shows better that I want : https://i.gyazo.com/81c191197374c0667f93bbc65dd31bd5.mp4