Here's a custom shirt from the show Soprano's, Using the tshirtproblk.txd
All you have to do is make a BACKUP OF UR FILE FIRST!
then open up IMGTool, open Player.img in /models dir, and search for tshirtproblk.txd
Then rebuild the archive.
will be makin more when i find sum time.
All done. enjoy.fuhgedaboutit!