You will need the casual outfit mesh by Lueppi from
here or
here for these outfits to show up in your game.
Here are 8 casual outfits for your normal/fit sim guys, consisting of a short sleeve overshirt and jeans.
They are organised into 2 sets with 4 outfits in each set.
Set 1.
Set 2.
Credits:
Mesh - Lueppi