Credits: vaagpnf
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To install: 
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1 - Using OpenIV, navigate to X64v.rpf. 
2 - Open Models folder. 
3 - Open cdimages folder. 
4 - Open streamedpeds_players.rpf. 
5- Open player_one. 
6 - Enable Edit Mode. 
7 - Drag and drop the files for the t-shirts you want to install. (You will have to delete the wrestlers names from the files, I put them there so if you want to replace a different shirt you know what shirt is which.)
9 - Disable Edit Mode. 
9 - Boot the game and enjoy! 