That dress looks too constricting, so you wouldn't be able to lift your leg up to kick someone in the face without ripping it. The shoes might work, but it may be hard to keep your balance in a serious fight.
I would suggest wearing full body armour and a greatshield, these would likely provide the best defence in battle.
However, if you're looking for something more nimble, try a leather suit for some protection, or if defence is of no concern, purchase a Deadpool ninja outfit and two katanas.
Good luck in your battles and may the force be with you.