How to make two regular t-shirts that have same graphic but each in different size?

So here’s my question in a photo form:

I wish this doesn’t require me to upload the same graphic twice with a different name… Because I already have to upload graphics twice or even three times just to get the colors I want to.

This is, however, the solution. Or, as I’ve said already, we’d invite you to have your customers adapt the designs to their liking.