you need @ngame layered tees pack for the shirt model
install in:
mods\x64v.rpf\models\cdimages\streamedpeds_mp.rpf\mp_m_freemode_01
for single player
Install to x64v.rpf>models>cdimages>streamedpeds_players.rpf>player_one
everything is drag and drop ready for fivem
Credits:
jeremydaking