Excerpts from a Mustang Monthly article that mentioned the Ghia:
Ford's Ghia studios in Turin, Italy, served as the inspiration for the Mustang Ghia luxury model. Introduced first in 1974, the Ghia was an upscale luxury edition Mustang with Ghia badges, optional vinyl top, a more plush interior, courtesy lamps, heavier pile carpeting, abundant sound deadening, rich wood grain appointments, a nicer steering wheel, and a more distinctive trim package. The Mustang Ghia was to 1979 what the Grande was to 1969-73.
The Ghia returned for 1980-81 with few changes.
Elsewhere in the Mustang lineup for 1982, the Ghia name was dropped and replaced with GLX. The GLX was a luxury package on a par with the Ghia. Lots of foo-foo inside and out.