@BaconSandwich — I was gonna say, that outfit reads almost as "uniform for some amorphously nostalgia-forward fast-food chain" today, but she probably thought herself very fashionable at the time.
Most (though not all) people these days would see the Mustang II as a relatively unloved generation, but at the time, many many people thought it easier to push in a gas line than the middle-class-living-room-on-wheels LTDs in the background... and, honestly, the Mustang was ready for a reset. In the previous couple of years, model bloat and feature creep had taken it far from its clean, simple, light-on-its feet origins, and it showed in the sales figures.