Why does Madame Loisel begin to cry after she reads the invitation?

In “The Necklace,” Madame Loisel is a woman whose beauty and charm seem to surpass her social class. Her marriage to a clerk does not allow her to have the nicer things she dreams about and feels she is entitled to have. She is quite angry about her situation. One day, her husband brings home an invitation to a fancy affair and presents it to his wife in the hopes that she will be excited. To his dismay, she is not happy about the invitation. Instead, she throws it on the table. Surprised about his wife's reaction, he explains what a great opportunity it would be for them to attend. She begins to cry and explains to her husband that he should give the invitation to someone whose wife would have something more appropriate to wear. She is upset because she feels she has nothing suitable to wear.