Nancy Drew Mystery Stores #63: The Twin Dilemma (1981)
Carson's sister Eloise invited the girls to stay with her and check out a big charity fashion show. As soon as they arrive though, she reveals that fashion model Jacqueline Henri disappeared. She was set to be the big star of the show. Luckily, Eloise already volunteered Nancy to take her spot. They rush over to the show, and see Jacqueline herself on the street before the woman rushes away. They also meet Mr. Reese, the famous fashion designer who donated some of his clothing. He immediately moans and whines that someone stole some of his designs. After throwing a fit and firing his assistant, he takes one look at Nancy and decides that she'll do for the show. When she walks out in the first outfit though, he throws another fit and pulls her off stage. He shows her the Millington catalog, which is a retail company that sells knock off designer fashions. Somehow, the company responsible for the catalog got his designs ahead of time and are already selling them. Acco