You will need the looser t-shirt mesh for the bodybuilder from
here for these to show up in your game.
Here are 16 1970's hand/tie dyed t-shirts for the bodybuilder. These are tops only.
They are organised into 4 sets with 4 t-shirts in each set.
Set 1.
Set 2.
Set 3.
Set 4.
Credits:
Mesh - Marvine & Beosboxboy