1. Open OpenIV
2. Go to GTAV/x64v.rpf/models/cdimages/streamedpeds_players.rpf/player_one/
3. Click on any shirt in the "upper_diff" section
4. Click replace and replace with files - "uppr_004_u.ydd", "uppr_diff_004_a_uni.ytd"

Greetings !