An hour later the front door opened nervously, and Gatsby, in a white flannel suit, silver shirt, and gold-colored tie, hurried in. He was pale, and there were dark signs of sleeplessness beneath his eyes.
Contrast Gatsby’s outer and inner state – sumptuously dressed, but his inner lack of confidence shows in his physical appearance. Gatsby’s white might be an gesture towards purity — Gatsby wants to woo her and seem like he is honest and pure. His silver and gold are meant to communicate old money — Gatsby wants to seem like an old money man, not a nouveau riche person.
His sleeplessness shows just how nervous he is about meeting Daisy.
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