I'll admit that I am one of those who tagged most of the initial posts for this tag and contributed a wiki definition, but I don't yet know how to set up tag aliases or implications.
Right now most of the images in costume_chart really do look like charts for comparison, except for post #546472 given its more cluttered nature. Since the purpose of a costume chart really is for comparison most of the time, should it get an implication for the comparison tag then? Would it then be more accurate to say costume_comparison instead of costume_chart, and if so, should these two alias each other?
Also, I'd like to know if the caveat I added in the wiki description is justified. Unless it's a straight comparison like post #620448 I think you really do need at least 3 different outfits or appearances for a single character to qualify for this tag, since a single character in just two costumes could more likely qualify for just the dual_persona tag.
Updated by jxh2154