The girl thought her outfit was flattering, when in actuality it was meretricious.

The definition of the word meretricious is apparently attractive but having in reality no value or integrity. For example: The souvenirs at the airport were meretricious.

Good Lord, that day-glo green seashell hula doll is meretricious!

Of or pertaining to prostitutes; having to do with harlots; lustful; as, meretricious traffic., Resembling the arts of a harlot; alluring by false show; gaudily and deceitfully ornamental; tawdry; as, meretricious dress or ornaments.

a superficial relationship