I could imagine them going with something like thisHonestly, Supergirl's costume is just so shitty.
I mean, it's something I'd want a girl to dress up in before we do the nasty. That's not what a heroic larger-than-life figure should wear.
She should have something more regal than fucking VAGINA SHIELD.
(Maybe without red arms)
Basically something similar to Supermans costume in Man of Steel