>>212994422 (OP)There are a couple of factors at play in why movie costumes look like dogshit compared to good cosplay.
1. Directors are arrogant and want to put "their spin" instead of giving people what they want.
2. The costume makers that make all the bad stuff have ingrained themselves into the Hollywood machine so much that their quality can be crap but studios will not allow outsiders in, even if there is much better to be had cheaply.
3. The neo-prudism surrounding female characters requires that they be covered up in formless bodysuits which requires major alteration to the original designs.