Shirtless (no jersey) - help needed

Hello, wondering if someone could help me achieve this
I am trying to swap one type of jersey (let’s say Nike U) to shirtless (invisible as I believe the mesh is underneath?)

I’ve extracted all files and modded stuff around but the best I was able to make so far is the entire players invisible (lol!)

Does anyone know the exact file/subfile I should be editing and how?

Thank you so much!