What is the aspect of social class in "The Necklace" by Guy De Maupassant?

One of the great ironies of Guy de Maupassant's short
story, The Necklace, is how Madame Loisel actually descends into a
lower class of life after her attempt to join high society on the night of the ball.
Unhappy with her perfectly acceptable middle class life, she pretended to be something
she wasn't in the hope of tasting how the upper class lived. And she did--for a few
hours one night. After losing the necklace, however, she and her husband were forced to
borrow money, give up their home, and work extra jobs in order to replace the necklace.
Instead of achieving a bit of upper class status while living in her middle class world,
Madame Loisel fell to even lower depths for a decade while working to pay for the
jewels.