Don't get distracted by the money aspect of things as the truly wealthy often don't dress well whatsoever. The biggest thing is etiquette, and knowing what to do, when to do it, and with whom to do it.
If I was in your position, I would do the following:
Charcoal, single breasted, double vent
Hermes patterned tie
White linen pocket square
Black cap toes
It is classic, but the fun in the tie can really help define you. The important thing...