I think it is not the costume or the cosplayer, but the character that hasn't aged well.

Base +14, derbertl -6

Nah...It's the lack of exposed boobs. E-hentai has something against any cosplayer that doesn't show tits.

Conversely, they fucking fall over each other defending the "cosplayers" whose costume amounts to little more than an off-the-shelf Spirit Of Halloween wig that barely resembles the character's hair.

Base +6