UNC's navy blue pants seem closer to Duke's Prussian blue than anything Duke wears these days.
From teamcolorcodes.com: "The North Carolina Tarheels [sic] colors are Carolina Blue, navy blue, silver and white."
Sage Grouse
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'When I got on the bus for my first road game at Duke, I saw that every player was carrying textbooks or laptops. I coached in the SEC for 25 years, and I had never seen that before, not even once.' - David Cutcliffe to Duke alumni in Washington, DC, June 2013