This shirt you can find in the luxury store.

Replace the file with OpenIV inside:

GTAV / x64v.rpf / models / cdimages / streamedpeds_players.rpf / player_one
remember the backup!

or put file with OpenIV inside:

GTAV / mods/x64v.rpf / models / cdimages / streamedpeds_players.rpf / player_one

tnks ;)