Daisy sobs when Gatsby shows her his collection of custom-made shirts because she knows it is impolite for him to show her the shirts in the first place and brag about how he had them created and imported.
Daisy is compared to silver in the metaphor. Gatsby is aware "of Daisy", flashing like silver, safe and high above the scorching struggles of the impoverished,"according to the novel.
Daisy appears to be too haughty and secure to be concerned about the plight of those who are poorer than herself. This hints that she is not quite as perfect as Gatsby thinks she is.
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