This is a large custom patch (appliqué) for an L-2B flight jacket by ALPHA INDUSTRIES (Alpha Industries). This is a fashion item by an apparel brand, inspired by the U.S. Air Force's L-2B jacket. The patch reads "JACKET FLYER'S LIGHTZONE L-2B ALPHA INDUSTRIES," indicating that it is a type of flight jacket designed for the light zone (temperatures between 10°C and 30°C). L-2B jackets and MA-1 jackets were originally manufactured for the U.S. military, but they are also highly popular as fashion items due to their durability and style.