You aren’t a kid anymore. So stop acting like one, and start being the grown azz man you ought to be.
A tailored black suit
A plain black suit is an essential part of any man's wardrobe. Tailoring is also important, because an ill-fitting suit makes you look like you're playing dress-up.
Black dress shoes
OK, maybe not a pair of Tom Ford dress shoes, but something similar. Just remember that you get what you pay for, so invest wisely.
Brown dress shoes
You need something to wear with khakis, or that blue (tailored) suit, right?
Stocks
Who cares if you know how the market works or not?