You will need the overalls mesh for the superhero series from
here for these to show up in your game.
Here are 16 raver outfits for the superhero bodytype.
They are organised into 4 sets with 4 outfits in each set.
Set 1.
Set 2.
Set 3.
Set 4.
Credits:
Mesh - Marvine and Beosboxboy