Original size 8.5x11 © 2016 Alex Ledante
If you're planning to slay frost giants, you'd best be prepared; that means bringing the biggest sword you can get your hands on...
On the other hand, it doesn't look like she's dressed for the Fimbuvettr to me but let's just assume she was wearing layers until the fight really got her heated up or possibly she didn't want to be weighed down by anything other than her backbuster blade
Cut her some slack, if she's slaying frost giants then she's doing the lord's work. And by the lord, I mean Wotan