Of course, it makes perfect sense that women would wear proper armor in a fight. Those that didn't, I always figured were somehow super agile or something to get away with the bare minimum. To be honest, I was always a bit too distracted to really ponder it.
But check out the pics and videos at Women Fighters in Reasonable Armor. Personally, I've always been a fan of Kitiara's blue dragon armor (and Laurana's ain't half-bad either), but it hasn't been posted yet.
Here are a couple of links to other shots of her armor. Hawt.
Wizards of the Coast
Arte de Encantamientos