Boy, I can feel how frustrating it must be for you right now. There are many legitimate reasons why you were turned down for the position. It's not like working for the government where a suit might make a difference in policy. In banking I imagine they can get away with almost anything. Whose going to represent you? Lawyers love money too! Bankers and lawyers; they're often members of some society, club, or association and they frequent the same social functions. You, an insignificant cowgirl, would be best looking for a more suitable horse; one that can love you back.
I would cut your losses and not focus on the negative too long, or the negative effect will do much more harm than losing a position. You need to be as positive as you can be to locate and present yourself well to another company. Suck it up and get back on your horse, and don't let the bastards get you down again, partner!
Love and best wishes,