most investment bank guys look the same. OTR dark suit plain or with chalk stripes, white or blue shirt with french cuffs. If you are in equities its no tie, IB is tie. No PS - ever but occasional banker cuff/collar. Any deviation from this gets the "alpha males" aka neanderthals worked up
For equities, I only wear a tie when I have an external meeting. However, we did have a guy who used to wear a tie everyday to work, but he was more the exception than the rule.