Apparently, if you want to be the new "George Clooney of finance" (remember Mark Carney?), BNP Paribas is your place to be!
Research by Emolument suggests nearly 40% of BNP bankers are still wedded to formal dress at all times, compared to just 20% at J.P. Morgan. [...]
In London, insiders suggest BNP staff are more sharply dressed than the rest because a comparatively high percentage are from France or Italy, where sartorial rectitude is more highly prized than in London or New York.
One French trader tells us he always has at least 15 white shirts with his initials embroidered on the cuff, for example.
From this article
Is the "Italian/French = Stylish" axiom still valid though? Honestly, I have seen many more bankers in Milan dressing chinos or sweaters rather than in London. Quite a stereotype imo.