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!