Judy invites Green to dinner. He comes from a poorer background than Judy. He does not have the family "pedigree" that she does. He does not want to dress or act carelessly to turn off Judy, his love interest.
Study Guide for Short Stories of F. Scott Fitzgerald
Short Stories of F. Scott Fitzgerald study guide contains a biography of F. Scott Fitzgerald, literature essays, quiz questions, major themes, characters, and a full summary and analysis of selected short stories.