Answer:
Unhappy people are never satisfied.
Explanation:
According to the given excerpt from "The Necklace", there's a conversation between two people who I assume to be a couple. From their discussion, the man got her a piece of clothing that he went to great trouble to get so she could wear it for a party but she was not pleased and spoke angrily to him.
Based on this, the theme that it likely supports is that unhappy people are never satisfied.
Plywood: a wood that folds over itself
Implicit: not obvious. folded into words.
"rosy-fingered Dawn" is a common epithet used in the Odyssey. An epithet is a phrase that is a description, and when used, everyone understands the reference. For example, another epithet would be "Son of Laertes" for Odysseus.