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In the University of Utah fight song it says … We'll fight for dear old crimson for a Utah Man/Fan am I!
Georgia Tech’s fight song includes this line: Oh! If I had a daughter, sir, I’d dress her in white and gold…
One of Utah State’s fight songs says: The Aggie blue and fighting white…
Those are colleges.
Still, their colors are a tradition, as are professional team colors.
Everyone gets alternate uniforms nowadays. A black version is the minimum. But the Jazz took it a step further by revealing their their Nike “City Edition.