I’m pretty sure the home team chooses what to wear. I don’t know how NW would get to determine who wore what for a road game.
Normally the home team wears darker unis. The road team wears white or another light color. (Games at LSU flip that; it’s their tradition.) Switching from that requires both teams to agree. Tulane didn’t ask to wear white until August 17, although this game has been scheduled for close to 10 years.