This mod replaces the White OG T-shirt with a White OG T-shirt with badge on it.

REMEMDER!! Make a backup of the x64v.rpf file in the Grand Theft Auto V folder

What you need:
OpenIV (can be downloaded here https://www.gta5-hub.com/tools/openiv)

How to install:
Open OpenIV and go to
x64v.rpf\models\cdimages\streamedpeds_players.rpf\player_one
click the edit button
replace the uppr_diff_004_a_uni.ytd file with the one you downloaded.