“What’s better than a great combo? That’s right, a Texas combo!” Legendary rodeo announcer Bob Tallman stood at the counter at a seventies-era Whataburger in Mesquite, about fifteen miles east of downtown Dallas. His made-for-the-arena voice boomed through the dining room in one of the chain’s last A-frame buildings in the state. Fresh-faced professional cowboys named Gus, Kash, and Pecos stood next to him, surrounded by swirling smoke from burgers searing on the flattop. They’re all clad in cowboy hats, big belt buckles, and crisp denim shirts, and they looked ready for a day of riding broncs and eating burgers. But instead, the rodeo pros were stepping out of their comfort zone to model a new apparel line: a whimsical Western collaboration between Whataburger and Wrangler.You…