Nice UI's and very slim is good part with keeping original size.
Best of all encapuslated so easy with update.
For inventory window, I would like to see mitigation number AND percentage.
Heck, what number means? Hell, I don't know but I feel much more comfortable with it and much easier to tack how much i get boost by equipements.
So it will be like :
Mitigation : xxxx ( yy %)
Seems like reistance would have %s as well. I would like to see those 2 number implementation on your UI.