There is no personal customisation right now.
Also there is no option now to have your emblem automatically on a shirt unlike other games.
The only way I could see this work is if we somehow are able to code that the game finds the uploaded emblem and drops it on the missing square we could add to the shirt model so it will automatically show the emblem.
edit: quickly made a preview of what it could be, though I wonder if the coders could make a code where it can find the uv map loc and connect it with the emblem in your folders.
http://puu.sh/rneQM/1b2b62b27e.jpg
http://puu.sh/rneIW/25e5aff7dc.jpg