The one I am looking for is for the "fashion" costumes and not for the character class. The dye has a star on it and specifies it in the description (see attatched)
I happen to see it in the auction again therefore I am able to get a shot for reference.
Leafia's link is working. The icons doesn't have a star on it. But notice "-Sage Costume Headwear Color-"
You can manually go by going to Eden's website > Item Mall > Fashion > Find the Costume Tab.
Make sure it says "COSTUME DYE".
You can only buy costume dyes in the web item mall.