Pearl-snap shirts have traditionally served a utilitarian purpose. The snaps allow a rancher to easily refasten the shirt if it gets snagged on barbed wire—no need to sew on a new four-hole button. The yoke, an extra layer of fabric over the shoulders and partly down the back, provides durability. And a touch of flair is woven into the chain-stitched designs, from yellow roses to Longhorn skulls, across the chest. But why should cowboys have all the fun?Three Texas brands are modernizing the pearl-snap shirt into a style to be worn meeting with friends at the bar on Friday night, toasting newlyweds on Saturday evening, or casting out a line on Sunday morning. According to Houston-based personal stylist Stevie Bingham, the modern take on the…