Installation:

1. Open OpenIV
2. Go to GTA V/x64v.rpf/models/cdimages/streamedpeds_players.rpf/player_one
3. Extract my files from zip.
4. Make sure to enable edit mode.
5. Replace the file « uppr_diff_004_c_uni.ytd » with my Attack on Titan T-shirt.
6. Close OpenIV and play.

Backup included.
Enjoy!