Johnny Novgorod said:
I think she becomes more powerful than the others AFTER losing the armor and fully exposing herself to the sun. Like Zod as well. And I really doubt the bikini pattern is for flexibility. Why isn't everybody else wearing it then?
It's not just power, though. I think (but can't prove) that the idea is that she is a Lightning Bruiser, as opposed to a straight-up brawler like the other Kryptonians. So more flexibility would serve her better than someone who's fighting style means they get hit a lot.
Minor nitpick: "A bikini is a type of women's two-piece swimsuit designed to provide minimal coverage of the body."
I hardly think her outfit can be considered a bikini, since it covers her whole body.