There's a chance.
We don't need no stinkin' Wiki to get outfit enchantments. Here's the procedure.
I have The Necbromancer's Stein.
I click on it and it opens the description: desc_item.php?whichitem=490267770
The description includes:
Outfit: Dark Bro's Vestments
(3 items)
The name of the outfit is, itself, a link.
Click on it and it opens the description: desc_outfit.php?whichoutfit=83
The description includes:
Outfit Bonus:
+20 Damage to Spooky Spells
+20 Damage to Sleaze Spells
So, if an item is in an outfit, we can now learn the outfit ID and the number of items in it, right from the description. We can look up the outfit and find the Outfit Bonus. The outfit name + effects is good enough to add an override to modifiers.txt.
The outfit number and the name of an item in it is, however, not quite enough to add the outfit to outfits.txt, since we don't know the other items in the outfit.