What I need to get this functions?

Hello everyone!

I would like to build page like this:

Sample page with customizer

as you can see, when choosing size of Tshirt like M, S, L 

DESIGN is automaticaly copying to new size without reload customizer. How to disamble reloading customizer?

Why? Because some clients need to buy the same Tshirt but meybe bigger or smaller one year later. and here is problem, because when I change Size I haven't got my design... Everything starts from clean product.

Help! :(