Blue Bell introduced the Wrangler jeans brand in 1947.
Wrangler was developed for the growing market for durable western clothing. Blue Bell selected the Wrangler name for its jeans and promoted the line through associations with rodeo and cowboy culture. The brand became especially known for practical cuts designed for work and riding.
The introduction came after Blue Bell had acquired the rights to produce clothing associated with the Casey Jones brand and had expanded its manufacturing operations. Wrangler’s early success helped establish it as one of the major American denim names alongside Levi’s and Lee.
The date is sometimes confused with later Wrangler product launches, including specialized western fits and collaborations. The question refers to the introduction of the Wrangler brand itself, not the later creation of a particular model.