You can't go wrong with a two-button, notched-lapel suit. It's a classic look that fits nearly every body type.
If your suit stands out or is too distinctive, your colleagues will remember it as the one you wear all the time.
In terms of color, keep it to various shades of gray and navy, with a few varieties of pinstripes. That's all you need. Brown suits are for back office guys.
Skip double-breasted and three-button suits altogether.
Buy as many suits as you can reasonably afford. And go bespoke or at least semi-made to measure. Remember, "an architect is only as good as his builder, and a fashion designer is only as good as your tailor."
Pocket squares are for bucket shop bankers and CNBC pundits. Skip it.
No pleats and no cuffs. Cuffed pants are for limo drivers.
A belt is generally optional, but in the United States, you should wear one.
Go with a small, symmetrical, half Windsor knot. And the general rule, especially at banks, is that you can't rock an Hermès tie until you have some clout. So, again, play it safe with Zegna or Giorgio Armani.
Picking out shoes doesn't need to be overly complicated. Keep it simple with some classic Prada loafers.
Don't be cheap with the shoes either; women notice. Besides, quality $700 shoes last 3-4x longer than anything you can get in the $300 price range.
Contrary to popular belief, flamboyant socks don't add flair or personality. They just make you look British. Instead, buy twenty pair of identical black socks. Throw them away and refresh every six months. It feels great to start the day off with brand new socks.