Phoebe as Robin Hood
I feel kind of horrible and dirty in saying this but Kira Kosarin none the less, looked really nice in her Robin Hood outfit from the "Robin Hood: Prince of Pheebs" episode.
https://www.google.com/search?q=the+thundermans+robin+hood&biw=1440&bih=809&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiN75vpvvDPAhWDPiYKHbGXCEcQ_AUICSgC