The Creeper. Is a red feather boa really practical?
As to fishnets, they actually create an optical illusion that legs are narrower and longer than they are. (I like the look, don’t get me wrong, but they actually can be practical, if even in a small way.)
Capes, while having their draw backs, they can be used as weapons for, just as easily as weapons against. Also, depending on length, the they can be used to shield parts of the body visually and well as creating a reduction in depth of field for your opponent, so also used as an optical illusion which can be an advantage.
As for PG’s cutout. There was an interesting description of given by PG herself, when talking to “Jimmy Olsen” even if he was an illusion created in her head by Psycho Pirate. Not knowing where she came from, figuring out she wasn’t related to Superman especially. (This quote may not be word for word accurate, going from memory) “I always thought I’d have a symbol on my chest, like superman or something, but I don’t know who I am or where I came from, so it just never happened.” (In the interest of full disclosure, I love PG’s traditional costume. It’s eye candy. If folks can have an admitted fetish for Nightwing’s butt, nothing wrong with a fetish about PG’s cleavage.)
I find really tall boots an odd costume choice, beyond just a fashion choice. They restrict movement, especially anything covers or goes over the knee.
I think one thing about costumes is even if you give up some practicality for the sake of fashion. If you think you look good, it creates a sense of confidence and positiveness about one’s self. This is a documented behavioral psychology observation. If you are going out to fight villains, often your mental state is more important than the practicality of what your wearing.