Final answer:
The dress in question is apricot-color shading into shell pink, blending well with Amy's skin tone.
Step-by-step explanation:
The color of the dress that David's first customer, Amy, asks about is described as an apricot-color fading into shell pink, which then fades into the pearl and pink whiteness of Amy's skin. This vivid description suggests that the dress harmonizes beautifully with Amy's complexion, prompting the saleswoman's encouragement as Amy admires herself in the mirror. This passage does a remarkable job at showcasing the nuances of colors and the effect they have in enhancing the wearer's natural hues.