I have the same issue. I included Cannibal's outfits (Bubba) as well as these new ones in all .json files that included outfits, though they are still not unlocking.
Not certain what the issue is, even after restarting Fiddler and reading through the Fiddlerscript properly.
EDIT: Never mind. Everything has now been unlocked except for Bubba's outfits, again. Bubba's outfits are the only two outfits in the game that are just not unlocking at all.
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Pardon the nuisance, though do you happen to know Cannibal's cosmetic pieces/outfits?
CA_outfit_006
CA_outfit_007
The above are the two that I have included, though Bubba's outfits are still not unlocked.
Is there something more to it, or are they perhaps incorrect?
EDIT #2: This is only my suspicion, though comparing the lines with other cosmetics, would it perhaps be resolved if I just manually added the following lines (for it to make more sense)?
CA_outfit_006
+
CA_Body006
CA_Mask006 (or is it CA_Head006?)
CA_W006
CA_outfit_007
+
CA_Body007
CA_Mask007 (or is it CA_Head007?)
CA_W007
... would manually typing and adding the above actually unlock Bubba's outfits, or am I perhaps mistaken?