You have to set the appropriate setting. All of the settings for VeracityMeatFarm start with "VMF".
From that, you can see that the setting name is "VMF.NEPOutfit" and if you don't set it, the default outfit name is Neverending Party. If you want another name, do this:
string nep_outfit = define_property( "VMF.NEPOutfit", "string", "Neverending Party" );
For the familiar:
set VMF.NEPOutfit=Your Outfit Name Here
The setting name is VMF.ItemFamiliar.
familiar item_familiar = define_property( "VMF.ItemFamiliar", "familiar", "none" ).to_familiar();
Perhaps you are omitting the "VMF."?