Hmm, looks like a few file names might be changed judging by this error I want to assume all character picture file names follow the format (character name)@outfit_[emotion possibly with more _ seperating words] and any not like that are wrong. Looking at the actual files there was a close file, but missing the _ between the outfit and emotion, and are probably a few more.
Got this from a scene going to the bathhouse will all 3 characters when backtracking to grab equipment, was heading back and remembered oh yeah town 3 has a bathhouse that gave me a go in alone option when I went only with serena
Edit: Guess I'll add that meia's alternate default outfits(where she goes topless/bottomless) need to be have their image names editted too, they have a _ after the @ or something like that, big pain to change. Funny side note, her alternate topless/bottomless outfit is more defensive than her full outfit when fully upgraded