/cgl/ - Cosplay & EGL

So my ex girlfriend who was quite a hardcore cosplayer (even placed in WCS) a decade or so back, used to hate the idea of taking a design of a costume, then changing it to make a personal adaption of the costume that would "work" better in the real world, to her, Cosplay was all about being as accurate to the source material as possible (to explain better, for the Batman films, if she did the costumes, she would have probably have straight up made costumes accurate as possible to the comic books, rather than come up with a new design for the film like the costume designers do)

So this is stuck in my head for a long time, because so many times I see cosplay, that while it works in a game or anime, just looks like shit in real life and I feel they could have worked if they took design elements of the original costume and put them into a new costume that works better in reality.
So I have to ask, what are your guys opinion on making a new adaption of a costume design for real world cosplay, instead of staying accurate to the source material? (Pic related)