- in Launch OpenIV, go into :

For the hat:
GTAV/mods/x64v/models/cdimages/streamedpedprops.rpf/player_one_p

For the tattoos:
GTAV/mods/x64v/models/cdimages/ped_sp_overlay_txds.rpf

For tshirt and short
GTAV/mods/x64v/models/cdimages/streamedpeds_players.rpf/player_one

- Drag and drop, and if you are not sure to keep this shit make a backup of the files before