I was watching and I wonder. Would any REAL woman want to fly around in a mini skirt that shows off her underwear?
In comic books of course she wears that but her skirt is always down. Not in real life. You would think they would have changed her costume for a live action show.
She doesn’t dress that way to attract men, but to feel good about herself.
Or something.
Would a real woman fly around in a bathing suit?
If so, is there any harm if she adds a skirt?
When I spin a partner in dance class, she is almost <wink> always wearing underwear that my wife calls dance pants. Supergirl’s dance pants have been briefly (ha! brief) seen in several shots. She’s also wearing panty hose.
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Supergirl’s costume is just a sign of her confidence and says “look all you want, guys, but remember that all of my muscles are super–do the words ‘hydraulic press’ mean anything to you?”
Girl of Steel, Man of Kleenex? 
*[Faith is in Buffy’s body]
Spike: You know why I really hate you, Summers?
Buffy: [as Faith] 'Cause I’m a stuck-up tight-ass with no sense of fun?
Spike: Well… yeah, that covers a lot of it.
Buffy: 'Cause I could do anything I want, and instead I choose to pout and whine and feel the burden of Slayerness? I mean, I could be rich. I could be famous. I could have anything. Anyone. Even you, Spike. I could ride you at a gallop until your legs buckled and your eyes rolled up. I’ve got muscles you’ve never even dreamed of. I could squeeze you until you popped like warm champagne and you’d beg me to hurt you just a little bit more. And you know why I don’t? Because it’s wrong. *
That’s just a Slayer. Can you imagine a Kryptonian?
Keep yer dick in a vise.
Enjoy,
Steven
As Waldo stated, her costume is basically a leotard with a skirt over it. Nothing to see here, people.
Lois Lane dressed in a similar costume as Superwoman as early as 1943:
It’s not really that revealing, as noted. The same logic that posits that Supergirl (or Superwoman) are showing their underwear under their skirts would imply that we’re always looking at Superman’s underwear.
Superman wears his underwear on the outside.
We are. Superman and Chuck Norris had a fight. The loser had to wear his underwear on the outside of his pants.
This is basically answer, it’s Superman’s costume with a mini skirt on top. She’s more covered than Superman, not less.
Even more covered, you can tell she has SuperBoobs. With Nips of Steel.
As Superman has said on more then one occasion, they are basically invisible up in the sky because no one thinks to look up unless they have a reason.
See also My Super ex-Girlfriend.
Woman of Steel, Bra of Kleenex?
Then why are people always pointing up and shouting “Look! Up in the sky…it’s a bird…it’s a plane…it’s a frog…”
You’ve never seen a cheerleader before?