If you mean the costumes for Halloween, I would like to know too. It's not career category for sure though. Might be one of the "unknown" categories that appear when editing the CASP in s3pe. Outerwear used to be "unknown12", now it appears with it's proper name but before it there are "unknown0F" "unknown10" and "unknown11".
I tried looking this up and found on simswiki (
http://simswiki.info/wiki.php?title...:CAS_Part_Flags) before outerwear categories called "Markings (non-horse)", "Child Imagination" (which must be the children costumes from Generations i guess) and then there's "Special" (unknown11?) maybe that's it? Gotta try it.
After Outerwear it says it's "Supernatural", but in
S3PE next is "Plumbotwear"