Answer:
bandwagon appeal
Step-by-step explanation:
The logical fallacy used in the statement: "Of course you’ll look great in high-waisted jeans. They’re in all the fashion magazines lately." is the bandwagon appeal. This is because it references the idea that since the jeans are in the latest fashion magazines, one would be inclined to agree with the possibility of looking well in the high-waisted jeans. Since the logic is that if it's found in popular fashion magazines, you might think that it would be good for you as it is to everyone else.