(1) Who's unsettled? You asked a question. I answered. No worries.
(2) So what? Maybe Selina Kyle just likes sexy boots ... damn the practicality. Maybe she'd rather adapt spike heels into melee weapons than risk wearing unflattering shoes. A woman making an impractical sexy shoe choice is hardly a major strain of credibility. My wife does it all the time. Heh.
Like I said, it isn't supposed to be absolutely realistic. Its just supposed to be more realistic than your average superhero story. Nolan's Gotham is not without its stretches of plausibility. Ras had a machine that instantly vaporized the entire water supply of a major city -- physically impossible. Joker escaped unnoticed in a schoolbus that was crashed into the side of a building in broad daylight -- implausible, at best. Rachael and Bruce survived a fall from a 30-story building (conservatively) -- which crushed a car -- without a scratch. They'd have been pulverized. These implausibilities are not "baked into the Batcake" (maybe the most ridiculous expression I've ever quoted).
Two Face needs to be scarred for the character to work. He need not be that freshly wounded. He had healed-up (as best he could) in every other incarnation I can think of. That the TDK version was functional, rather than writhing in pain, with that fresh a wound is a strain of credibility. If you can overlook that ... you can overlook Catwoman's boots. Hell ... if you want to have a problem with the costume, the fact that her hair and most of her face is exposed, yet she maintains a secret identity, is a bigger issue than her shoes. And ... even that doesn't bother me a lick.
Ask not what sexy boots do for Selina Kyle ... simply enjoy what they do for you.
SnakeDoc