My Design but their choice of Design Color, Shirt Color and Shirt Size

[21_Inspired]

Hello! I am looking for an app that allows me to upload my design but will allow customers to choose the color of that design, along with the color and size of the shirt that I will put the design on. 

All the apps I have been able to find only allow customers to upload their own designs or text. I do not want that option at all. Just my design, in different colors. I want them to be able to choose which size and color of shirt to have the design on. 

I would appreciate any direction! Thank y'all!