This question could be interpreted in two ways, both in terms of plot and of theme. When Daisy Fay meets Gatsby in Louisville during World War I, he is a young officer in uniform, one of many dashing young men of rank who vie for Daisy's attention. His uniform gives him standing and respectability in her eyes. Gatsby does not overtly lie to Daisy about his personal circumstances, but she is misled by his appearance. Nick explains:
. . . he had deliberately given Daisy a sense of security; he had let her believe that he was a person from much the same strata as herself--that he was fully able to take care of her. As a matter of fact he had no such facilities--he had no comfortable family standing behind him . . . .
Gatsby's uniform creates a false appearance in that it masks his poverty and lower-class roots in North Dakota.
Daisy is also misled by appearances when she chooses to marry Tom Buchanan. His great fortune and membership in the upper class of American society make Daisy believe that life with Tom will be a good life. It is not. Although she enjoys the luxuries Tom's money provides, Daisy's life becomes endless days of superficial activities. Hers is a hollow life without purpose, and Tom's infidelities cause her pain and anger. In Chapter I she argues with Tom privately when Myrtle Wilson calls their home; in Chapter VII her resentment boils over when she tells Tom, "You're revolting." The emptiness of Daisy's life is first suggested in Chapter I when Nick comes to dinner at the Buchanan estate. When Jordan Baker suggests they should "plan something," Nick recalls her response:
"All right," said Daisy. "What'll we plan?" She turned to me helplessly. "What do people plan?"
Daisy's life with Tom Buchanan does not turn out to be what she had expected it to be. Once again, appearances have been deceiving.