Johnny Matzelle, 34, who works in digital media sales, recently sported a vintage Knicks cardigan to his office. Joi-Marie McKenzie This post originally appeared in the BI Today newsletter. You can sign up for Business Insider's daily newsletter here. When the dress code is team spirit It only takes a few glances around New York City's Financial District, where Business Insider's offices are located, to see how the city has gotten in on team spirit. Whether it's the New York Knicks or their...