In ch.1, we were told that Sir Walter considered Anne "faded and thin", and that in ch.13, she has not only regained some of her "bloom", but that Lady Russell feels she has "improved in plumpness and looks", increased plumpness being part of her improved looks!

In ch.16, "Anne and her father chancing to be alone together, he began to compliment her on her improved looks: he thought her "less thin in her person, in her cheeks".