Installation Path:
Grand Theft Auto Grand Theft Auto V\mods\update\x64\dlcpacks\mpgunrunning\dlc.rpf\x64\models\cdimages\mpgunrunning_male.rpf\mp_m_freemode_01_mp_m_gunrunning_01

Remember to back up your files!

This is a Texture for Rounded T-Shirt by TideFN.
Download the Model here:
https://www.gta5-mods.com/player/rounded-t-shirt-for-mp-male

Recommended to use MP Clothes!
Download the Add-On here:
https://www.gta5-mods.com/misc/mpclothes-addon-clothing-slots