Skirts? Absolutely yes. Armoured skirts, some of them quite short are pretty common in bronze and iron age warfare (and probably later).
What wasn't common was a bare midriff you had an armour top. But also women fighting in anything but an emergency wasn't common so I think it's fair to suggest a lot of warriors who IRL went into battle in naught but a weapon, maybe a shield, and a loincloth/sandals would have also had some kind of boob cover if female. And that might have been ornate or decorative if they were high-status.
It's obviously a bit silly, but at the same time, unless you have a strong idea for a redesign of the character, it's part of their look, in the same way Captain America's slightly undersized shield is (man would have been shot in the face, dick, and knees/shins so many times).